Support JdbcIO autosharding in Python

[pabloem]

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[chamikaramj]

LGTM. Thanks.

[chamikaramj]

(let's add a Jira or point to an existing Jira for tracking)

[codecov]

Codecov Report

Merging #16921 (5025f4e) into master (5345834) will increase coverage by 9.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #16921      +/-   ##
==========================================
+ Coverage   74.67%   83.80%   +9.13%     
==========================================
  Files         657      468     -189     
  Lines       82593    65268   -17325     
==========================================
- Hits        61674    54697    -6977     
+ Misses      19919    10571    -9348     
+ Partials     1000        0    -1000     

Flag	Coverage Δ
python	83.80% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/io/jdbc.py	78.26% <ø> (ø)
...s/interactive/dataproc/dataproc_cluster_manager.py	77.41% <0.00%> (-4.01%)	⬇️
...ache_beam/runners/dataflow/test_dataflow_runner.py	29.62% <0.00%> (-3.03%)	⬇️
...nternal/clients/cloudbuild/cloudbuild_v1_client.py	52.21% <0.00%> (-2.97%)	⬇️
sdks/python/apache_beam/internal/gcp/auth.py	78.66% <0.00%> (-2.82%)	⬇️
...ers/portability/fn_api_runner/watermark_manager.py	93.33% <0.00%> (-2.67%)	⬇️
sdks/python/apache_beam/coders/row_coder.py	94.49% <0.00%> (-2.51%)	⬇️
sdks/python/apache_beam/utils/retry.py	83.05% <0.00%> (-2.39%)	⬇️
sdks/python/apache_beam/runners/common.py	87.94% <0.00%> (-2.04%)	⬇️
sdks/python/apache_beam/io/gcp/gcsfilesystem.py	88.65% <0.00%> (-1.35%)	⬇️
... and 379 more

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[pabloem]

Run Python 3.8 PostCommit

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[github-actions]

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[pabloem]

Run Python 3.8 PostCommit

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