Add a cop to detect safe navigation uses with respond_to?

[tas50]

Is your feature request related to a problem? Please describe.

I noticed autocorrecting some of our older code that the suggested code by RuboCop is actually totally unnecessary and it seems like a place where codebases could be simplified.

Our original code was:

next unless attrs && attrs.respond_to?(:[]) 

RuboCop suggested:

next unless attrs&.respond_to?(:[]) 

There's really no need for the &. safe navigation though because even nil has respond_to?. This can just be autocorrected to:

next unless attrs.respond_to?(:[]) 

Describe the solution you'd like

A new cop to remove unnecessary safe navigation

Describe alternatives you've considered

🤷

Additional context

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