feat!: impl admin command

[killme2008]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional

Close #4462

What's changed and what's your intention?

Supports admin statement to run administration functions, for example:

mysql> admin flush_table('test');
+---------------------------+
| ADMIN flush_table('test') |
+---------------------------+
|                         0 |
+---------------------------+
1 row in set (0.02 sec)

mysql> admin compact_table('test');
+-----------------------------+
| ADMIN compact_table('test') |
+-----------------------------+
|                           0 |
+-----------------------------+
1 row in set (0.01 sec)

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 68.93939% with 82 lines in your changes missing coverage. Please review.

Project coverage is 84.62%. Comparing base (a3b8d2f) to head (9ddcaa9).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4600      +/-   ##
==========================================
- Coverage   84.93%   84.62%   -0.32%     
==========================================
  Files        1096     1099       +3     
  Lines      196750   196999     +249     
==========================================
- Hits       167110   166710     -400     
- Misses      29640    30289     +649