chore: decide tag column in log api follow table schema if table exists

[paomian]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

• The write log api uses the greptime_identity pipeline to follow the tag column of a table that already exists when writing.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 95.74468% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.77%. Comparing base (3d1b8c4) to head (904433b).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5138      +/-   ##
==========================================
- Coverage   84.04%   83.77%   -0.28%     
==========================================
  Files        1168     1172       +4     
  Lines      217625   218180     +555     
==========================================
- Hits       182902   182779     -123     
- Misses      34723    35401     +678     

[sunng87]

almost lgtm. we just need to 1. update comments of identity_pipeline to describe why the table is here. 2. provide some unit tests when table is not none.

[shuiyisong]

Mostly LGTM. Please add some tests.