feat: Add HCL support

[ianlewis]

Description:

Add support for Hashicorp Configuration Language (HCL - Terraform, etc.)

Related Issues:

Fixes #1586

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

All modified and coverable lines are covered by tests ✅

Project coverage is 76.46%. Comparing base (500f911) to head (22d9c33).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1592      +/-   ##
==========================================
+ Coverage   76.24%   76.46%   +0.21%     
==========================================
  Files          17       18       +1     
  Lines        1187     1198      +11     
==========================================
+ Hits          905      916      +11     
  Misses        205      205              
  Partials       77       77              

Files with missing lines	Coverage Δ
internal/scanner/languages.go	100.00% <100.00%> (ø)