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

[CookiePieWw]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#5208

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 88.18182% with 13 lines in your changes missing coverage. Please review.

Project coverage is 83.89%. Comparing base (3d9df82) to head (b8df128).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5244      +/-   ##
==========================================
- Coverage   84.15%   83.89%   -0.27%     
==========================================
  Files        1200     1202       +2     
  Lines      225386   226081     +695     
==========================================
- Hits       189682   189673       -9     
- Misses      35704    36408     +704     

[CookiePieWw]

Updated with meta_table_name. This pr may be conflicted with #5260 and further txn pr, so I'd like to leave this for a while and resolve the possible conflicts in this pr since it's expected to be simpler.

[fengjiachun]

Rest LGTM

[killme2008]

@CookiePieWw Lots of conflicts.

[CookiePieWw]

Rewrite with both configurable lock id and meta table name. PTAL @killme2008 @WenyXu @fengjiachun