[FLINK-38525][python] Fix coder doesn't process TIMESTAMP_LTZ correctly

[fsk119]

What is the purpose of the change

Currently, PyFlink supports to convert datetime object without timezone to TIMESTAMP_LTZ, which is different with java behaviour. In java, users can convert instant object to TIMESTAMP_LTZ only. Therefore, I think we should throw an exception to notify users.

Brief change log

• Adjust LocalZonedTimestampType behaviour to support datetime with tz
• Fix coder's behaviour: use the datetime's tz to convert the object to milliseconds in encoding phase.
• Fix coder's behaviour: use the local tz to restore milliseconds to datetime object in decoding phase.

[flinkbot]

CI report:

• 74ed2bc Azure: FAILURE

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