[Feature] Add support for subrouters

[YourTechBud]

The problem faced currently?

Different groups handlers often use different plugins. We have no way to configure plugins for just a subset of handlers registered in a worker.

How can we solve it?

We want something like this:

        router.Use(middleware2, middleware3)
        router.Use(middleware1)
        router.Route(func(subrouter *server.Router){
                subrouter.Query("query1")
                subrouter.With(middleware5).Mutation("query2")

                // Use can be called after Query, Mutation
                subrouter.Use(middleware4)
        })

        router.Query("query3")

        // In this example the following middlewares should be applied to each query in specified order
        // query1 -> 2, 3, 1, 4
        // query2 -> 2, 3, 1, 4, 5
        // query3 -> 2, 3, 1

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