Cop for require_dependency usage

[ngan]

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

For rails apps that are using Zeitwerk, all usages of require_dependency should be deprecated.

Describe the solution you'd like

We've written a cop to look for this and thought it'd be a good idea to share it here. Is this something maintainers would be interested in? It would probably be disabled by default since not even is on Zeitwerk yet.

[koic]

I think this cop can be accepted. Ideally, it should be disabled the cop when static analysis can determine that the classic loader (not Zeitwerk) is used, but I think first behaviour can start by disabling the cop by default.

[ngan]

I'm closing this because my coworker is pushing our implementation up: #447