tests: add tests for go/vt/sqlparser

[Maniktherana]

Description

Bumps coverage to 92.6% for analyzer.go

Related Issue(s)

#14931

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f751c83) 47.49% compared to head (f5ecbb7) 47.55%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15057      +/-   ##
==========================================
+ Coverage   47.49%   47.55%   +0.06%     
==========================================
  Files        1149     1149              
  Lines      239475   239475              
==========================================
+ Hits       113730   113894     +164     
+ Misses     117138   116969     -169     
- Partials     8607     8612       +5     

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[GuptaManan100]

These tests don't feel very useful. They are testing one-to-one the switch case of the corresponding function.