[FLINK-14267][connectors/filesystem]Introduce BaseRow Encoder in csv for filesystem table sink.

[leonardBang]

What is the purpose of the change

This pull request introduce BaseRow Csv Encoder in csv format for filesystem table sink..

Brief change log

• Introduce BaseRow Csv Encoder.
• Reuse current CsvRowSerializationSchema to deal csv serialzation.

Verifying this change

Add unit tests in CsvBaseRowDeSerializationTest.

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)
  This PR is just part of new feature filesystemTableSink and will add docs when the umbrella tasks finished.

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Automated Checks

Last check on commit 5a3f35f (Fri Apr 03 14:23:39 UTC 2020)

Warnings:

• 1 pom.xml files were touched: Check for build and licensing issues.
• No documentation files were touched! Remember to keep the Flink docs up to date!
• This pull request references an unassigned Jira ticket. According to the code contribution guide, tickets need to be assigned before starting with the implementation work.

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CI report:

• 71cd806 Azure: FAILURE

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[leonardBang]

@azagrebin thanks for update the PR link ^_^

[azagrebin]

@leonardBang no worries, I also created this kind of PR couple of times :)

[JingsongLi]

Thanks @leonardBang for contribution, left some comments.

[JingsongLi]

Looks like this is just a lambda function. You can merge this PR to FormatFactory PR.

[leonardBang]

merged in #11755