feat: Add PowerShell support.

[ianlewis]

Description:

Add PowerShell support.

Related Issues:

Updates #460

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 80.95238% with 4 lines in your changes missing coverage. Please review.

Project coverage is 76.15%. Comparing base (786713e) to head (589fd24).
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/scanner/scanner.go	78.94%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1543   +/-   ##
=======================================
  Coverage   76.14%   76.15%           
=======================================
  Files          17       17           
  Lines        1174     1191   +17     
=======================================
+ Hits          894      907   +13     
- Misses        203      206    +3     
- Partials       77       78    +1     

Files	Coverage Δ
internal/scanner/languages.go	89.28% <100.00%> (ø)
internal/scanner/scanner.go	73.15% <78.94%> (+0.16%)	⬆️