fix: overflow when parsing default value with negative numbers

[killme2008]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#4351

What's changed and what's your intention?

Fixed overflow when parsing default constraints with negative numbers.

Close #4351

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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[killme2008]

Not a great solution, but make it work first. @WenyXu @waynexia

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.61%. Comparing base (7896201) to head (7caccff).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4459      +/-   ##
==========================================
- Coverage   84.88%   84.61%   -0.28%     
==========================================
  Files        1081     1081              
  Lines      193045   193035      -10     
==========================================
- Hits       163858   163327     -531     
- Misses      29187    29708     +521     

[waynexia]

Add a sqlness case for this could be more concrete

[killme2008]

Add a sqlness case for this could be more concrete

Done