MySQL driver instrumentation

[MrAlias]

Add instrumentation for the mysql package.

[codecov-commenter]

Codecov Report

Merging #90 (cc1f970) into main (9bc2eb1) will increase coverage by 0.73%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
+ Coverage   87.28%   88.02%   +0.73%     
==========================================
  Files          17       18       +1     
  Lines         535      568      +33     
==========================================
+ Hits          467      500      +33     
  Misses         49       49              
  Partials       19       19              

Flag	Coverage Δ
Linux	88.02% <100.00%> (+0.73%)	⬆️
Windows	88.02% <100.00%> (+0.73%)	⬆️
macOS	88.02% <100.00%> (+0.73%)	⬆️

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Impacted Files	Coverage Δ
.../github.com/go-sql-driver/mysql/splunkmysql/sql.go	100.00% <100.00%> (ø)

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[pellared]

Please make sure it is tested E2E before merging 😉

Can you also create an issue to add integration tests after merging?

[pellared]

I see some build issues, but other than that LGTM 👍