feat: add preserve arg to sqlness runner

[waynexia]

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Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Add --preserve-state CLI arg to prevent temp dir from cleaning on exit. Sqlness runner in CI will use it to preserve logs and state.

Use tempdir because tempfile cannot set a prefix on temp dir.

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 85.12%. Comparing base (3e9bda3) to head (2095dae).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3724      +/-   ##
==========================================
- Coverage   85.43%   85.12%   -0.31%     
==========================================
  Files         966      966              
  Lines      162088   162088              
==========================================
- Hits       138482   137984     -498     
- Misses      23606    24104     +498     

[fengjiachun]

LGTM

[fengjiachun]

@waynexia sqlness test failed

[waynexia]

Do you have any idea about the compatibility test @MichaelScofield ? It now relies on "dirty sqlness state", which is a bug IMHO. I'm going to comment out that test until we find a better way to test the compatibility

[waynexia]

E.g.: maintain a dedicated Python script to create tables and write data into two versions and compare them.