Add documentation for S3GlueConnector.

[vmmusings]

Description

• Added and modified documentation for s3 Glue Connector and spark execution engine settings.
• Documentation Links:
  * S3 Connector: https://github.com/vamsi-amazon/sql/blob/main/docs/user/ppl/admin/connectors/s3glue_connector.rst
  * Async APIs: https://github.com/vamsi-amazon/sql/blob/main/docs/user/interfaces/asyncqueryinterface.rst

Issues Resolved

[List any issues this PR will resolve]

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #2229 (2538b6e) into main (5f76037) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is n/a.

❗ Current head 2538b6e differs from pull request most recent head c176525. Consider uploading reports for the commit c176525 to get more accurate results

@@            Coverage Diff            @@
##               main    #2229   +/-   ##
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  Coverage     96.34%   96.34%           
  Complexity     4725     4725           
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  Files           439      439           
  Lines         12682    12682           
  Branches        871      871           
=========================================
  Hits          12219    12219           
  Misses          454      454           
  Partials          9        9           

Flag	Coverage Δ
sql-engine	96.34% <ø> (ø)

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