Reference support for S4 methods

[gowerc]

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Is your feature request related to a problem? Please describe. Vscodes reference features (e.g. where it shows all instances of where a function is defined and used) doesn't currently work for S4 methods. Instead it just returns "no definition was found".

Describe the solution you'd like It would be good for S4 methods to work with the vscode reference system (apologies if I'm getting the terms wrong)

Describe alternatives you've considered None

Additional context Nope