fix: distinguish delimiters in queries from SQL comments

[wellwelwel]

Fixes #21, Fixes sidorares/node-mysql2#4083.

Adds a layer to AST to distinguish when delimiters are used inside backticks.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ca998a7) to head (409e2fb).
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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #22   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          386       401   +15     
=========================================
+ Hits           386       401   +15     

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