Allow setting ssl-mode option for connections

[quinnj]

Hopefully fix https://github.com/JuliaDatabases/MySQL.jl/issues/201.

[codecov[bot]]

Codecov Report

Merging #202 (487ba57) into main (a8ae1c7) will decrease coverage by 0.02%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   64.47%   64.44%   -0.03%     
==========================================
  Files           9        9              
  Lines        1109     1111       +2     
==========================================
+ Hits          715      716       +1     
- Misses        394      395       +1     

Impacted Files	Coverage Δ
src/api/consts.jl	88.15% <ø> (ø)
src/MySQL.jl	68.38% <50.00%> (-0.28%)	:arrow_down:

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