[Common] Add centrality estimator using FT0C and the outer channels from FT0A

[jesgum]

This PR adds the centrality estimator FT0MOuterA which as the title mentions, uses both A and C side. However, the inner channels on the A side (the channels that saturate) are excluded.

Tagging @ddobrigk

[github-actions]

O2 linter results: ❌ 34 errors, ⚠️ 37 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 3e42959 at 2026-08-21 04:38:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 28 errors and 54 warnings.'
Found 28 errors and 54 warnings.
++ [[ 28 -gt 0 ]]
++ cat /sw/BUILD/6de00fa69bbffb2066b219ad9f1d3461f9307e1d/O2Physics-code-check/errors.txt
Common/Tools/Multiplicity/MultModule.h:317:80: error: do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead [cppcoreguidelines-pro-bounds-array-to-pointer-decay,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:357:5: error: 'mRunNumber' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:358:5: error: 'mRunNumberCentrality' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:359:5: error: 'lCalibLoaded' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:360:5: error: 'lCalibObjects' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:361:5: error: 'hVtxZFV0A' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:362:5: error: 'hVtxZFT0A' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:363:5: error: 'hVtxZFT0C' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:364:5: error: 'hVtxZFDDA' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:365:5: error: 'hVtxZFDDC' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:366:5: error: 'hVtxZNTracks' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:367:5: error: 'hVtxZNMFTTracks' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:368:5: error: 'hVtxZNGlobalTracks' should be initialized in a member initializer of the constructor [cppcoreguidelines-prefer-member-initializer,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:432:14: error: parameter 'name' is passed by value and only copied once; consider moving it to avoid unnecessary copies [performance-unnecessary-value-param,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:689:23: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:690:23: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:691:23: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:692:23: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:693:23: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:694:26: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:695:29: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:696:32: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:1099:20: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:1103:25: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:1253:119: error: the const qualified parameter 'generatorName' is copied for each invocation; consider making it a reference [performance-unnecessary-value-param,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:1254:38: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:1255:32: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
Common/Tools/Multiplicity/MultModule.h:1449:19: error: variable 'v0m' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
++ [[ 54 -gt 0 ]]
++ cat /sw/BUILD/6de00fa69bbffb2066b219ad9f1d3461f9307e1d/O2Physics-code-check/warnings.txt
Common/Tools/Multiplicity/MultModule.h:49:1: warning: nested namespaces can be concatenated [modernize-concat-nested-namespaces]
Common/Tools/Multiplicity/MultModule.h:107:14: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
Common/Tools/Multiplicity/MultModule.h:394:5: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
Common/Tools/Multiplicity/MultModule.h:426:17: warning: redundant string initialization [readability-redundant-string-init]
Common/Tools/Multiplicity/MultModule.h:429:5: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
Common/Tools/Multiplicity/MultModule.h:433:9: warning: member initializer for 'mCalibrationStored' is redundant [modernize-use-default-member-init]
Common/Tools/Multiplicity/MultModule.h:434:9: warning: member initializer for 'mhMultSelCalib' is redundant [modernize-use-default-member-init]
Common/Tools/Multiplicity/MultModule.h:435:9: warning: member initializer for 'mMCScalePars' is redundant [modernize-use-default-member-init]
Common/Tools/Multiplicity/MultModule.h:436:9: warning: member initializer for 'mMCScale' is redundant [modernize-use-default-member-init]
Common/Tools/Multiplicity/MultModule.h:482:5: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
Common/Tools/Multiplicity/MultModule.h:674:13: warning: the 'empty' method should be used to check for emptiness instead of comparing to an empty object [readability-container-size-empty]
Common/Tools/Multiplicity/MultModule.h:872:32: warning: statement should be inside braces [readability-braces-around-statements]
[0 more errors; see full log]

Full log here.

[alibuild]

Error while checking build/O2Physics/staging for 3e42959 at 2026-08-20 17:31:

## sw/BUILD/O2Physics-latest/log
c++: fatal error: Killed signal terminated program cc1plus
ninja: build stopped: subcommand failed.

Full log here.