tests: fuzz test alter table add columns

[discord9]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

added some fuzz tests that cocurrently add columns through mysql or prom remote write

Please explain IN DETAIL what the changes are in this PR and why they are needed:

• add a fuzz tests that add column using sql
• another fuzz tests that auto add columns by prom remote write protocol

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 55.17241% with 39 lines in your changes missing coverage. Please review.

Project coverage is 83.74%. Comparing base (485782a) to head (352b7f2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5008      +/-   ##
==========================================
- Coverage   83.99%   83.74%   -0.26%     
==========================================
  Files        1147     1147              
  Lines      214040   214119      +79     
==========================================
- Hits       179778   179309     -469     
- Misses      34262    34810     +548