Add ValidateSqlQueries which handles multiple statements per query

[ncabatoff]

I'm leaving ValidateSqlQuery unchanged, because I'm not sure if all PG drivers support multiple statements, e.g. jackc/pgx#1090 was closed as completed but I don't see anything in the changelog suggesting support was added.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 67.81%. Comparing base (5f05ce8) to head (55a93ea).

Files with missing lines	Patch %	Lines
pkg/vet/vet.go	0.00%	11 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   68.45%   67.81%   -0.65%     
==========================================
  Files           9        9              
  Lines        1154     1165      +11     
==========================================
  Hits          790      790              
- Misses        290      301      +11     
  Partials       74       74              

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