Generate doc ID in build index job for idempotency

[dai-chen]

Description

1. Generate a new ID column __id__ (avoid conflict with user data) as spark.datasource.flint.write.id_name. The underlying Flint data source writer uses this to deduplicate by OpenSearch create API. This happens when Spark streaming job retry failed batch after restart.
2. Exclude old version log4j which causes UT failure in IDE.

TODO: figure out how to add IT for fault tolerance.

Issues Resolved

opensearch-project/opensearch-spark#2

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #1803 (d7bff3e) into feature/flint (91b2a06) will not change coverage.
The diff coverage is n/a.

❗ Current head d7bff3e differs from pull request most recent head adeed60. Consider uploading reports for the commit adeed60 to get more accurate results

@@               Coverage Diff                @@
##             feature/flint    #1803   +/-   ##
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  Coverage            97.19%   97.19%           
  Complexity            4107     4107           
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  Files                  371      371           
  Lines                10464    10464           
  Branches               706      706           
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  Hits                 10170    10170           
  Misses                 287      287           
  Partials                 7        7           

Flag	Coverage Δ
sql-engine	97.19% <ø> (ø)

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