gorilla/mux HTTP framework is archived without active maintainers

[d-ylee]

As of December of 2022, the https://github.com/gorilla/mux HTTP routing framework is archived without active maintainers.

If this becomes an issue in the long run, one solution would be to replace gorilla/mux with the Go standard library http.ServeMux request multiplexer.

Some R&D is necessary to see how viable it is to replace gorilla/mux with https://pkg.go.dev/net/http#ServeMux

[vkuznet]

@d-ylee , I suggest to migrate to bunrouter, see its documentation. I migrated one of my Cornell/CHESS R&D projects which was based on gorilla/mux to butrouter and you can find all details in this commit: vkuznet/MLHub@48d497e

The router part is trivial, but we'll need to convert middleware module. Since I reuse middleware code among two different projects my commit includes all necessary changes too.