Create Gitlab/BoundedContexts cop

Issue: Enforce bounded contexts with Rubocop Cop (#456132 - closed)

What does this MR do and why?

Creates Gitlab/BoundedContexts cop

• See Enforce bounded contexts with Rubocop Cop (#456132 - closed)

MR acceptance checklist

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Before	After

How to set up and validate locally

1. Run rubocop rule from console in gitlab directory:

   bundle exec rubocop --parallel --force-exclusion --only="Gitlab/BoundedContexts" .