💥 Remove builtin mysql adapter

[Fs02]

Extracted to: https://github.com/go-rel/mysql

[codecov]

Codecov Report

Merging #256 (40cf414) into master (d3aa0b8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #256   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           55        54    -1     
  Lines         3884      3840   -44     
=========================================
- Hits          3884      3840   -44     

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