[FLINK-11827][table-runtime-blink] Introduce DataFormatConverters to convert internal data format and java format

[JingsongLi]

What is the purpose of the change

Introduce DataFormatConverters java class to convert internal data format and java format

Verifying this change

ut

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, Yarn/Mesos, 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)

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[KurtYoung]

Thanks for the effort, i have some questions about the responsibility of the converter

[JingsongLi]

Hi @KurtYoung @wuchong , thanks for reviewing. I addressed your comments.

[KurtYoung]

LGTM, merging...