feat: Add Vim Script support

[ianlewis]

Description:

Adds support for Vim Script.

Related Issues:

Updates #460
Fixes #1538

Checklist:

• Review the CONTRIBUTING.md documentation.
• Add a reference to a related issue in the repository.
• Add a description of the changes proposed in the pull request.
• Add unit tests if applicable.
• Update documentation if applicable.
• Add a note in the CHANGELOG.md if applicable.
• Sign the Google CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 63.20755% with 39 lines in your changes missing coverage. Please review.

Project coverage is 76.14%. Comparing base (308b0db) to head (72333dd).
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/scanner/scanner.go	54.76%	24 Missing and 14 partials ⚠️
internal/scanner/state.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1541      +/-   ##
==========================================
- Coverage   77.11%   76.14%   -0.97%     
==========================================
  Files          17       17              
  Lines        1088     1174      +86     
==========================================
+ Hits          839      894      +55     
- Misses        182      203      +21     
- Partials       67       77      +10     

Files	Coverage Δ
internal/scanner/languages.go	89.28% <100.00%> (+12.36%)	⬆️
internal/scanner/state.go	0.00% <0.00%> (ø)
internal/scanner/scanner.go	72.98% <54.76%> (-3.99%)	⬇️