[FLINK-31791] FLIP-292: Enhance COMPILED PLAN to support operator-level state TTL configuration - ASF JIRA

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This is the parent task of FLIP-292.

Testing discovered

FLINK-31884 Upgrade ExecNode to new version causes the old serialized plan failed to pass Json SerDe round trip

FLINK-31917 Loss of Idempotence in JsonSerDe Round Trip for AggregateCall and RexNode

1.	Introduce StateMetadata	Closed	Jane Chan
2.	Support 'EXPLAIN' statement for CompiledPlan	Closed	Shuai Xu
3.	Extend the CompiledPlan to read from/write to Flink's FileSystem	Closed	Shuai Xu
4.	Add documentation for the user story	Closed	Jane Chan
5.	Introduce left and right state retention time to StreamingJoinOperator	Closed	Jane Chan
6.	Introduce StateMetadata to ExecNode to support configure operator-level state TTL via CompiledPlan	Closed	Jane Chan
7.	Add subdirectory of test output file for JsonPlanTest to indicate the plan's version	Closed	Jane Chan
8.	Revert upgrading ExecNode versions for StateMetadata	Closed	Jane Chan