[FLINK-20948][table-planner-blink] Introduce StreamPhysicalDeduplicate, and make StreamExecDeduplicate only extended from ExecNode

[godfreyhe]

What is the purpose of the change

Separate the implementation of StreamExecDeduplicate

Brief change log

• Introduce StreamPhysicalDeduplicate, and make StreamExecDeduplicate only extended from ExecNode

Verifying this change

This change is a refactoring rework covered by existing tests.

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

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Last check on commit 9bf8957 (Fri May 28 07:07:41 UTC 2021)

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[wenlong88]

LGTM, left a reminder to update the out-of-date doc.

[wenlong88]

the doc is out of date, deduplicate based on rowtime is supported now.