fix: compile error after updating protos

[killme2008]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

The ColumnDef has a new field comment, we have to resolve the compile errors.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Merging #2435 (73a0a9b) into develop (5566f34) will decrease coverage by 0.05%.
Report is 1 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2435      +/-   ##
===========================================
- Coverage    77.64%   77.59%   -0.05%     
===========================================
  Files          729      729              
  Lines       115106   115114       +8     
===========================================
- Hits         89369    89318      -51     
- Misses       25737    25796      +59