feat: Groovy support

[ianlewis]

Description:

Adds support for Groovy files.

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.
• Add a note in the CHANGELOG.md if applicable.
• Sign the Google CLA.

[codecov]

Codecov Report

Merging #784 (890d737) into main (29e943f) will increase coverage by 0.26%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #784      +/-   ##
==========================================
+ Coverage   80.50%   80.76%   +0.26%     
==========================================
  Files          19       19              
  Lines        1144     1144              
  Branches       14       14              
==========================================
+ Hits          921      924       +3     
+ Misses        160      158       -2     
+ Partials       63       62       -1     

see 1 file with indirect coverage changes