[FLINK-37045][Runtime] Merge two versions of OperatorStateStore #1446

Job	Run time
Pre-compile Checks / Basic QA	10m 50s
Default (Java 11) / Compile	9m 3s
Default (Java 11) / Test packaging/licensing	34m 14s
Default (Java 11) / E2E (group 1)	1h 28m 7s
Default (Java 11) / Test (module: core)	30m 56s
Default (Java 11) / E2E (group 2)	1h 53m 18s
Default (Java 11) / Test (module: python)	28m 38s
Default (Java 11) / Test (module: table)	38m 1s
Default (Java 11) / Test (module: connect)	21m 36s
Default (Java 11) / Test (module: tests)	35m 0s
Default (Java 11) / Test (module: misc)	28m 54s
	7h 18m 37s

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