Add chefstyle library file for Rake backwards compatibility

[dafyddcrosby]

Description

There's a decent amount of Rake code that uses require "chefstyle" to set the defaults for RuboCop (eg https://github.com/chef/ohai/blob/6d64237f9987c3bf51805e19884e6e710c3a40f6/Rakefile#L19), and rather than doing surgery on each repo's Rakefile, it'd be easier to keep that same behavior for loading the configuration and cops. With this change a migration involving Rake should only involve a Gemfile update and changing require "chefstyle" to require "cookstyle/chefstyle".

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.
• [ ] 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.

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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