Support for gorilla/mux router

[EwenQuim]

Create an adaptor for the gorilla/mux router, cf #327 & #374

[Simplyauf]

Can I attempt this issue?

[evilenzo]

@Simplyauf of course you can! Just for you info, there is existing mux adaptor but it's combined with std adaptor and not fully supports mux (look at linked issue about regexes in path).
https://github.com/go-fuego/fuego/blob/main/net_http_mux.go

[EwenQuim]

Don't hesitate @Simplyauf :) It's actually quite easy to create an adapter, you just have to satisfy the interfaces fuego.Context[B, P] and

interface {
	Register() Route[T, B, P]
}

and create helper functions. Just copy/paste from the fuegogin and fuegoecho packages!