feat(sql): enhance SQL injection detection with improved string concatenation checks

[oittaa]

fixes #1448

Also fixes other formatting detection issues. See the samples files for more info.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 65.19337% with 63 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.24%. Comparing base (1216c9b) to head (6c541b1).
⚠️ Report is 152 commits behind head on master.

Files with missing lines	Patch %	Lines
helpers.go	0.00%	33 Missing ⚠️
rules/sql.go	79.72%	17 Missing and 13 partials ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1454      +/-   ##
==========================================
- Coverage   68.49%   65.24%   -3.26%     
==========================================
  Files          75       80       +5     
  Lines        4384     4900     +516     
==========================================
+ Hits         3003     3197     +194     
- Misses       1233     1556     +323     
+ Partials      148      147       -1     

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