refactor: split up different stmts

[CookiePieWw]

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Refer to a related PR or issue link (optional)

proto pr: GreptimeTeam/greptime-proto#199

What's changed and what's your intention?

The patch splits the alter commands of SET FULLTEXT [WITH <options>] and UNSET FULLTEXT into different enum for simplicity.

Also forbids to change column fulltext options if it has been set before to avoid unexpected query results, e.g.

> ALTER TABLE test MODIFY COLUMN message SET FULLTEXT WITH(analyzer = 'Chinese', case_sensitive = 'true');
> ALTER TABLE test MODIFY COLUMN message UNSET FULLTEXT;
> ALTER TABLE test MODIFY COLUMN message SET FULLTEXT WITH(analyzer = 'Engilish', case_sensitive = 'true');

will fail, since the third alter will change the analyzer.

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 73.85892% with 63 lines in your changes missing coverage. Please review.

Project coverage is 83.75%. Comparing base (63bbfd0) to head (7dcd82d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4997      +/-   ##
==========================================
- Coverage   84.01%   83.75%   -0.27%     
==========================================
  Files        1149     1149              
  Lines      214810   214997     +187     
==========================================
- Hits       180474   180066     -408     
- Misses      34336    34931     +595     

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[WenyXu]

There are some conflicts

[WenyXu]

Rest LGTM

[zhongzc]

LGTM