This closes #11023

  - Checkstyle violations in JavaDocs
  - Remove use of 'checkNotNull' on primitive types, which looks like a confusion/oversight.
    It is not checking anything and results in unnecessary boxing/unboxing.

Thread interruption and InterruptedException are implementation details
and shouldn't be exposed. Throw CancelTaskException instead which is a part of informal contract.

This closes #11006.

Subsumed by #getUserConfig()

[FLINK-15916][docs] Remove outdated sections for Asnc Snapshots and Network buffers from Tuning Checkpoints and Large State

This updates the code generation for the new type inference and thus
completes FLINK-15487. Scalar function work with the types supported
by the planner. Tests added in this PR only test basic behavior. We
will need more tests per data type. But this is a follow up issue.

This closes #10960.

[FLINK-15706][table-planner-blink] Fix LastValueAggFunctionWithOrderTest compilation error due to incompatible types

This partially reverts the commit dcc13303 and uses the initial approach from #10158 of using Enclosed annotation. The problem with the TestSpec approach was that the top level classes shouldn't use generics as they are stripped when instantiated by JUnit runner which may lead to generic signature mismatch.

This closes #10915

This closes #11012

closes #11008

Version is already declared in root pom.

This closes #11000.

[FLINK-15658][table-planner-blink] Fix duplicate field names exception when join on the same key multiple times (#11011)

This closes #10784

When the cluster is shut down in standalone mode, the task manager is shut down via SIG_TERM signal. In this case, the shuffle directories created by FileChannelManager would not be removed finally.

To solve this issue, we register the shut down hook before creating directories in the constructor of FileChannelManagerImpl.

This closes #10736

This moves most in-depth RocksDB contents to te State Backends docs.
The "tuning large state" docs only refer to actual tuning and trouble-shooting.