feat(config): make table name of pg backend configurable

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Refer to a related PR or issue link (optional)

#5244

What's changed and what's your intention?

As title. I init a separate config, but seems it's better to place the table name under the previous kvbackend config?

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[codecov]

Codecov Report

Attention: Patch coverage is 82.83582% with 23 lines in your changes missing coverage. Please review.

Project coverage is 83.68%. Comparing base (dad8ac6) to head (ee5b93f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5244      +/-   ##
==========================================
- Coverage   83.93%   83.68%   -0.25%     
==========================================
  Files        1203     1203              
  Lines      224144   224193      +49     
==========================================
- Hits       188125   187624     -501     
- Misses      36019    36569     +550