Add SQL Commenter

[XSAM]

Resolves #109

SQL Commenter is an EXPERIMENTAL feature and may be changed or removed in a later release. This depends on the specification for context propagation for SQL statements.

[codecov]

Codecov Report

Merging #112 (10c5a31) into main (360af23) will increase coverage by 0.5%.
The diff coverage is 93.5%.

@@           Coverage Diff           @@
##            main    #112     +/-   ##
=======================================
+ Coverage   80.1%   80.6%   +0.5%     
=======================================
  Files         12      13      +1     
  Lines        664     692     +28     
=======================================
+ Hits         532     558     +26     
- Misses       107     109      +2     
  Partials      25      25             

Impacted Files	Coverage Δ
commenter.go	90.9% <90.9%> (ø)
config.go	90.6% <100.0%> (+0.6%)	⬆️
conn.go	78.3% <100.0%> (ø)
option.go	100.0% <100.0%> (ø)

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