Commits on May 4, 2022

1. Make keys method aware of `Rails/DeprecatedActiveModelErrorsMethods… …

   …` cop
   
   This PR makes `keys` method aware of `Rails/DeprecatedActiveModelErrorsMethods` cop.
   It can emulate the following Rails's warning.
   
   ```console
   DEPRECATION WARNING: ActiveModel::Errors#keys is deprecated and will be removed in Rails 6.2.
   ```
   
   The following is a bad / good example.
   
   ```ruby
   # bad
   user.errors.keys.include?(:attr)
   
   # good
   user.errors.attribute_names.include?(:attr)
   ```

   

   koic committed May 4, 2022
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