[Fix #8063] Add new AllowedNames option for Naming/ClassAndModuleCamelCase

[tejasbubane]

Closes #8063

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Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
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• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[bbatsov]

You should also extend the cop documentation a bit. One thing that concerns me is that it's not very clear that "AllowedNames" can also just a part of a name (the way the code is currently written). I'm not sure I like this, as this adds ambiguity. Better docs or a clearer approach are the way to go here.

[tejasbubane]

@bbatsov Added config info to cop documentation & default.yml.

[bbatsov]

I see the docs check task is failing. Looking at the diff you made some changes to the cop docs, but didn't run the docs update rake task afterwards.

[bbatsov]

I'm afraid you'll have to rebase again. Too much dev activity today. :-)

[bbatsov]

Victory! 😆 Thanks for the quick reaction! 🙇‍♂️