fix: expand SET ? in multi-statement queries

[wellwelwel]

Fixes #26, Closes #25.

• Also fixes the regression reported in Regression on placeholders sidorares/node-mysql2#4126 (comment), Regression on placeholders sidorares/node-mysql2#4126 (comment) and fix(security): resolve a potential SQL injection bypass through objects sidorares/node-mysql2#4054 (comment).

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (103b7a4) to head (94f9b97).
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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #34   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          423       439   +16     
=========================================
+ Hits           423       439   +16     

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