[FLINK-38541][checkpoint] Introducing config option: execution.checkpointing.unaligned.during-recovery.enabled

[1996fanrui]

What is the purpose of the change

Introducing config option: execution.checkpointing.unaligned.during-recovery.enabled, and some refactors.

Brief change log

• [hotfix][runtime] Extract RecordFilter as the interface
• [hotfix] Extract VirtualChannel as the public class
• [FLINK-38541][checkpoint] Introducing config option: execution.checkpointing.unaligned.during-recovery.enabled
• [FLINK-38541][checkpoint] Randomize UNALIGNED_DURING_RECOVERY_ENABLED for testing

Verifying this change

• Introduced RecordFilterTest
• Added tests for CheckpointingOptionsTest

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? yes
• If yes, how is the feature documented? JavaDocs

[flinkbot]

CI report:

• ca52afa Azure: FAILURE

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