Support Timestamp type in xlang JDBC Read and Write

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Part of #19817

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Codecov Report

Merging #22561 (b0484e7) into master (0c82583) will increase coverage by 0.04%. The diff coverage is 91.30%.

@@            Coverage Diff             @@
##           master   #22561      +/-   ##
==========================================
+ Coverage   73.69%   73.73%   +0.04%     
==========================================
  Files         713      713              
  Lines       94821    94974     +153     
==========================================
+ Hits        69874    70030     +156     
+ Misses      23648    23645       -3     
  Partials     1299     1299              

Flag	Coverage Δ
python	83.55% <91.30%> (+0.04%)	:arrow_up:

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Impacted Files	Coverage Δ
sdks/python/apache_beam/typehints/schemas.py	93.84% <89.47%> (-0.31%)	:arrow_down:
sdks/python/apache_beam/coders/row_coder.py	94.82% <100.00%> (+0.13%)	:arrow_up:
sdks/python/apache_beam/portability/common_urns.py	100.00% <100.00%> (ø)
sdks/python/apache_beam/runners/direct/executor.py	96.46% <0.00%> (-0.55%)	:arrow_down:
...pi/org/apache/beam/model/pipeline/v1/schema_pb2.py	100.00% <0.00%> (ø)
...g/apache/beam/model/pipeline/v1/schema_pb2_urns.py	100.00% <0.00%> (ø)
sdks/python/apache_beam/dataframe/io.py	89.26% <0.00%> (+<0.01%)	:arrow_up:
...ks/python/apache_beam/runners/worker/sdk_worker.py	89.09% <0.00%> (+0.15%)	:arrow_up:
...hon/apache_beam/runners/worker/bundle_processor.py	93.79% <0.00%> (+0.49%)	:arrow_up:
sdks/python/apache_beam/io/fileio.py	96.67% <0.00%> (+0.68%)	:arrow_up:
... and 4 more

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test passed: https://ci-beam.apache.org/job/beam_PostCommit_Python38_PR/556/testReport/apache_beam.io.external.xlang_jdbcio_it_test/

R: @TheNeuralBit

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Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

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Rebased in order to update CHANGES.md. ready for review now.

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postcommit test apache_beam.io.external.xlang_jdbcio_it_test.CrossLanguageJdbcIOTest.test_xlang_jdbc_read Failed

Apparently the branch itself works but now failing when merge onto master. Investigating.

Update: related to the change of #22679. After it tests fail.

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Rebased onto latest master; the last commit is a fix of test

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