Add a cop for Ruby 3 deprecated methods in Socket

[tas50]

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

Ruby 3 deprecates Socket.gethostbyaddr and Socket.gethostbyname. See https://bugs.ruby-lang.org/issues/13097. It would be really great if RuboCop would detect these deprecated methods to cleanup codebases automatically.

Describe the solution you'd like

Detection and correction of the legacy methods.

[AndreiEres]

@tas50 I can't imagine how we can autocorrect that. Could you explain it? Or we can do it without autocorrection.

[tas50]

It should get flagged even if it can't be autocorrected, but the error message gives a pretty clear update for most use cases.

[bbatsov]

Agreed.

[AndreiEres]

So check it out please #9732