Add ERB Lint Support

[ryanseamless]

What's Changed

Add support for ERB Lint to lint ruby template files.

Callouts

• These commits are a bit messy, let me know if they should be squashed before merging.
• I've had to add commandArgs to the test params, erblint wasn't playing nice without specifying which files to test. I think this is appropriate, and could be useful for testing for other languages.
• My test cases are very minimal, but seem in line with the tests for rubocop

Testing Notes
Added testing that roughly matches the test cases for rubocop. Everything passes. I've also been running this code from my fork with SeamlessMD's ERB files without issues

[ocean90]

Thank you!