[chefstyle] import Chefstyle cops and config

Description

There's already a lot of overlap with Chefstyle, and maintaining one repo instead of two makes development and maintenance easier for everyone. I've imported the files from main (currently https://github.com/chef/chefstyle/tree/129344227d927ea67f228540654a6718265d03cd) and only changed chefstyle.yml as Chef/Ruby/Ruby27KeywordArgumentWarnings is already available in Cookstyle as Chef/Deprecations/Ruby27KeywordArgumentWarnings.

To run the chefstyle configs one uses the --chefstyle argument (captured in bin/cookstyle to avoid more invasive patching of RuboCop), which uses chefstyle.yml instead of cookstyle.yml.

Diff of bin/chefstyle --show-cops in chefstyle repo and bin/cookstyle --chefstyle --show-cops: https://gist.github.com/dafyddcrosby/417dde82d1507313f59dae80898c5271

While this makes the imported Chef/Ruby cops available to Cookstyle, they are disabled by default. Before and after diff of cookstyle --show-cops: https://gist.github.com/dafyddcrosby/922112f26f0d90f66a4d7b832f7a465a

Related Issue

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)
[ ] Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

[x] I have read the CONTRIBUTING document.
[x] I have run the pre-merge tests locally and they pass.
[x] I have updated the documentation accordingly.
[ ] I have added tests to cover my changes.
[ ] If Gemfile.lock has changed, I have used --conservative to do it and included the full output in the Description above.
[x] All new and existing tests passed.
[x] All commits have been signed-off for the Developer Certificate of Origin.

chef / cookstyle