Improve pipe runtime memory allocation

[Caideyipi]

Summary

• allocate pipe TsFile parser, sink batch, and TsFile read buffers from PipeMemoryManager only while active
• resize tablet and IoTConsensusV2 batch memory by actual buffered data, and release it on success, discard, or close
• bound TsFile read buffer allocation by the current file size across thrift, airgap, legacy, and IoTConsensusV2 sinks

Tests

• mvn spotless:apply -pl iotdb-core/datanode
• git diff --check
• mvn -pl iotdb-core/datanode -DskipTests compile (fails on existing non-pipe compile issues: missing commons-collections4 ComparatorChain, missing SystemConstant authentication keys, missing ColumnHeaderConstant showCreate headers, and related generated aggregation symbols)

[sonarqubecloud]

Quality Gate failed

Failed conditions
11.7% Duplication on New Code (required ≤ 5%)

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 17.99163% with 196 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.40%. Comparing base (fcd52d7) to head (b8a28f5).

Files with missing lines	Patch %	Lines
.../protocol/thrift/sync/IoTDBDataRegionSyncSink.java	0.00%	55 Missing ⚠️
...builder/IoTConsensusV2TransferBatchReqBuilder.java	0.00%	50 Missing ⚠️
...oad/evolvable/batch/PipeTabletEventPlainBatch.java	14.28%	18 Missing ⚠️
...ler/IoTConsensusV2TsFileInsertionEventHandler.java	0.00%	18 Missing ⚠️
...hrift/async/handler/PipeTransferTsFileHandler.java	0.00%	18 Missing ⚠️
.../payload/evolvable/batch/PipeTabletEventBatch.java	61.76%	13 Missing ⚠️
...rotocol/iotconsensusv2/IoTConsensusV2SyncSink.java	0.00%	10 Missing ⚠️
...pipe/sink/protocol/legacy/IoTDBLegacyPipeSink.java	0.00%	9 Missing ⚠️
...ad/evolvable/batch/PipeTabletEventTsFileBatch.java	44.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #18051    +/-   ##
==========================================
  Coverage     41.40%   41.40%            
  Complexity      318      318            
==========================================
  Files          5286     5286            
  Lines        369547   369685   +138     
  Branches      47815    47828    +13     
==========================================
+ Hits         153008   153086    +78     
- Misses       216539   216599    +60     

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