ci: add ASan job for Android

[jpnurmi]

Adds an Android ASan CI job using API 36 and NDK 30 on x86_64. ASan instruments both pytest binaries and Gradle tests, including the in-process crash paths.

Side note: The build plumbing also supports TSan, but no TSan CI job is enabled yet. On Android, the TSan runtime crashes when threaded tests start with an internal tsan_rtl.cpp:1036 assertion with NDK 27 and a segmentation fault with NDK 30. If/when it works with later versions, adding a TSan job will be a matter of declaring a matrix entry.

Close: #962
Ref: #974

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.32%. Comparing base (00b5467) to head (3d5a693).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2036      +/-   ##
==========================================
+ Coverage   74.29%   74.32%   +0.03%     
==========================================
  Files         104      104              
  Lines       26653    26692      +39     
  Branches     4848     4854       +6     
==========================================
+ Hits        19802    19840      +38     
- Misses       5493     5505      +12     
+ Partials     1358     1347      -11     

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