refactor: remove region id, rename types, remove table ident

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Bump greptime-proto to the latest commit GreptimeTeam/greptime-proto@81495b1

Notable changes:

• remove region id / region number in Frontend services (Database)
• rename types, e.g., ts_second to timestamp_second
• remove table ident from proto

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 #2378 (d8bf8f3) into develop (9c76d2c) will increase coverage by 0.00%.
Report is 1 commits behind head on develop.
The diff coverage is 59.67%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2378   +/-   ##
========================================
  Coverage    77.54%   77.55%           
========================================
  Files          716      716           
  Lines       113722   113665   -57     
========================================
- Hits         88188    88148   -40     
+ Misses       25534    25517   -17     

[waynexia]

duplicated with #2368