[To dev/1.3] Fix oversized Load TsFile piece dispatch

[Caideyipi]

Backports #18627 to dev/1.3.

This keeps the dev/1.3-specific implementation while adding Thrift frame-size discovery, sender-side slicing, receiver-side validation and assembly, cleanup integration, and tests.

Compatibility notes:

• dev/1.3 uses raw status strings because the newer compile-time i18n mechanism is not present.
• The assembler returns a heap ByteBuffer because this branch deserializes through ByteBuffer.array().

Validation:

• mvn -o -pl iotdb-protocol/thrift-datanode -am generate-sources -DskipTests
• mvn -o -pl iotdb-core/datanode -DskipTests test-compile
• mvn -o -pl iotdb-core/datanode -Dtest=DataNodeInternalRPCServiceImplLoadTest,LoadTsFileDispatcherImplTest,LoadTsFilePieceNodeAssemblerTest test (with JDK 17 module opens and -Xmx1g)
• 15 tests passed, 0 failures, 0 errors