[To dev/1.3] [Pipe] Support pooled TsFile parsing

[Caideyipi]

Description

Pooled TsFile parsing

• Adds opt-in processor.tsfile-parser.parallelism for the built-in do-nothing processor.
• Runs admitted TsFile parser tasks in a shared executor while respecting the existing global and per-Pipe-region parser admission limits.
• Keeps custom processors and the default configuration serial.

Ordering, retry, and lifecycle

• Lets the source TsFile own the ordered commit id while parsed tablets retain its progress reference, so progress is committed only after all generated output is released.
• Preserves parser progress across retryable failures, retries permanent failures through the existing subtask retry path, and releases in-flight or pending events on close.
• Allows progress-report and heartbeat control events to pass the parser barrier without splitting a run of parseable TsFiles.

Parser output memory backpressure

• Byte-accounts parsed tablets waiting in the sink queue and reserves downstream memory headroom before publishing them, preventing parallel parsers from exhausting the memory needed to drain the queue.
• Accounts tablet sink batches as tablet memory and releases queue reservations on poll, clear, and discard paths.
• Adds focused tests for parser concurrency, retry, progress ownership, memory admission, and pending-queue reservation release.

Scope

This PR intentionally does not include the TsFile local sink, its writer/tests, or the source-TsFile grouping metadata used only by that sink. Configurable TsFile parser selection is already present on dev/1.3 via #18449 and is not duplicated here.

Verification

• mvn spotless:apply -DskipTests
• mvn -pl iotdb-core/datanode -am '-Dtest=PipeProcessorSubtaskExecutorTest,PipeRawTabletInsertionEventTest,PipeMemoryManagerTest,PropertiesTest' '-Dsurefire.failIfNoSpecifiedTests=false' '-DskipITs' '-Dcheckstyle.skip=true' '-Dspotless.check.skip=true' test (26 tests, 0 failures)
• mvn -pl iotdb-core/node-commons -am '-Dtest=BlockingPendingQueueTest' '-Dsurefire.failIfNoSpecifiedTests=false' '-DskipITs' '-Dcheckstyle.skip=true' '-Dspotless.check.skip=true' test (2 tests, 0 failures)
• mvn -pl 'iotdb-core/node-commons,iotdb-core/datanode' -am '-DskipTests' '-Dspotless.check.skip=true' checkstyle:check (0 violations)

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This PR has:

• been self-reviewed.
  • concurrent read
  • concurrent write
  • concurrent read and write
• added documentation for new or modified features or behaviors.
• added Javadocs for non-trivial methods.
• added comments explaining intent where the concurrency and memory behavior is not obvious.
• added or updated unit tests for new code paths.

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Key changed/added classes (or packages if there are too many classes) in this PR

• PipeProcessorSubtask
• PipeEventCollector
• PipeRawTabletInsertionEvent
• PipeTsFileInsertionEvent
• PipeMemoryManager
• BlockingPendingQueue / UnboundedBlockingPendingQueue