Support UNIX socket connections in the MySQL generator

[termermc]

The Generate function in mysql_generator.go does not support connecting to the server over a local UNIX socket, this PR adds support for that.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.15%. Comparing base (adef2f9) to head (a03029a).

Files with missing lines	Patch %	Lines
generator/mysql/mysql_generator.go	60.00%	3 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (60.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #538      +/-   ##
==========================================
- Coverage   92.19%   92.15%   -0.04%     
==========================================
  Files         139      139              
  Lines        8584     8593       +9     
==========================================
+ Hits         7914     7919       +5     
- Misses        493      496       +3     
- Partials      177      178       +1     

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