Add SHOW RECEIVERS support

[Caideyipi]

Summary

• add tree-model SHOW RECEIVERS and table-model information_schema.receivers support
• track active pipe receiver sessions, sender endpoints, pipe IDs, handshake/transfer timestamps, and request counts
• wire DataNode/ConfigNode thrift and air-gap receiver runtime recording

Tests

• mvn "-Ddevelocity.off=true" -pl iotdb-core/node-commons -Dtest=PipeReceiverRuntimeRegistryTest test
• mvn "-Ddevelocity.off=true" -DskipTests compile -pl iotdb-core/antlr,iotdb-core/relational-grammar,iotdb-core/node-commons,iotdb-core/confignode
• mvn "-Ddevelocity.off=true" -DskipTests spotless:check -pl iotdb-core/node-commons,iotdb-core/datanode,iotdb-core/confignode,iotdb-core/relational-grammar,iotdb-core/antlr
• git diff --check

Notes

• DataNode focused compile is still blocked by unrelated generated Freemarker/calc symbols such as IFill, LinearFill, Accumulator, ComparatorChain, and IoTDBConfig.getModeMapSizeThreshold().
• ConfigNode receiver records proxied through DataNode use receiver_node_id = -1 because the current proxy path does not expose the exact target ConfigNode id.

[codecov]

Codecov Report

❌ Patch coverage is 57.68293% with 347 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.42%. Comparing base (7a23a98) to head (ffb798e).

Files with missing lines	Patch %	Lines
...eceiver/protocol/thrift/IoTDBDataNodeReceiver.java	15.12%	101 Missing ⚠️
...mmons/pipe/sink/client/IoTDBSyncClientManager.java	0.00%	42 Missing ⚠️
...ipe/receiver/protocol/IoTDBConfigNodeReceiver.java	0.00%	24 Missing ⚠️
...b/queryengine/plan/planner/LogicalPlanBuilder.java	0.00%	24 Missing ⚠️
...iotdb/commons/pipe/receiver/IoTDBFileReceiver.java	61.22%	19 Missing ⚠️
...db/pipe/sink/protocol/writeback/WriteBackSink.java	62.50%	18 Missing ⚠️
...db/db/queryengine/plan/analyze/AnalyzeVisitor.java	0.00%	18 Missing ⚠️
...ueryengine/plan/planner/OperatorTreeGenerator.java	0.00%	13 Missing ⚠️
...ecution/operator/source/ShowReceiversOperator.java	83.60%	10 Missing ⚠️
...an/planner/plan/node/source/ShowReceiversNode.java	54.54%	10 Missing ⚠️
... and 21 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17869      +/-   ##
============================================
+ Coverage     41.19%   41.42%   +0.22%     
  Complexity      318      318              
============================================
  Files          5273     5280       +7     
  Lines        368330   369082     +752     
  Branches      47681    47753      +72     
============================================
+ Hits         151734   152881    +1147     
+ Misses       216596   216201     -395     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
B Reliability Rating on New Code (required ≥ A)

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