[FLINK-21648] FLIP-151: Incremental snapshots for heap-based state backend - ASF JIRA

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FLINK-26853 HeapStateBackend ignores metadata updates in certain cases

1.	Allow HeapBackend snapshotting customization	In Progress	Roman Khachatryan	Actions
2.	Allow HeapBackend RestoreOperation customization	In Progress	Roman Khachatryan	Actions
3.	Allow HeapBackend creation customization	In Progress	Roman Khachatryan	Actions
4.	Allow extension of CopyOnWrite state classes	In Progress	Roman Khachatryan	Actions
5.	Notify CheckpointStrategy about checkpoint completion/abortion	In Progress	Roman Khachatryan	Actions
6.	Allow reuse of PeriodicMaterializationManager	In Progress	Roman Khachatryan	Actions
7.	Fix race condition in CopyOnWriteStateMap	In Progress	Roman Khachatryan	Actions
8.	Bump CopyOnWriteStateMap entry version before write	In Progress	Roman Khachatryan	Actions
9.	Implement incremental checkpoints	Open	Roman Khachatryan	Actions
10.	On heap state restore, skip key groups from other state backends	Resolved	Roman Khachatryan	Actions
11.	Add extension points to heap backend to read/write incremental snapshots	Resolved	Roman Khachatryan	Actions