[FLINK-20921][python] Support SqlTimeTypeInfo in Python DataStream

[HuangXingBo]

What is the purpose of the change

This pull request Support SqlTimeTypeInfo in Python DataStream

Brief change log

• Support SqlTimeTypeInfo in Python DataStream

Verifying this change

This change added tests and can be verified as follows:

• Added relational UT in PythonTypeUtilsTest
• Added IT in test_sql_timestamp_type_info in test_data_stream.py

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/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

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

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Automated Checks

Last check on commit 0350eeb (Fri May 28 07:07:07 UTC 2021)

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• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
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• ❓ 5. Overall code [quality] is good.

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CI report:

• 0350eeb Azure: SUCCESS

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[WeiZhong94]

LGTM, just a little redundant code in test cases that could be cleaned up.

[WeiZhong94]

The sorts is unnecessary.

[HuangXingBo]

@WeiZhong94 Thanks a lot for the review. I have addressed the comments at the latest commit.

[dianfu]

LGTM