chore: create database api change in protobuf

[CookiePieWw]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

close #3662

What's changed and what's your intention?

database_name to schema_name corresponding to the change in greptime-proto.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.84%. Comparing base (2398918) to head (7a582c9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3682      +/-   ##
==========================================
- Coverage   85.16%   84.84%   -0.32%     
==========================================
  Files         951      951              
  Lines      158924   159005      +81     
==========================================
- Hits       135341   134910     -431     
- Misses      23583    24095     +512     

[WenyXu]

Thanks!🙏