Accept Routes with arbitrary error type in `PathCodec#/`

[achinaou]

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

Currently, PathCodec#/ requires the Routes passed to it to have the errors handled and/or mapped to Response.

This limits where it can be used, as someone may want to handle the errors at a later point.

//> using dep dev.zio::zio-http:3.0.0-RC8

import zio.*
import zio.http.*
import zio.http.codec.PathCodec.literal

object Application extends ZIOAppDefault:

  val routes: Routes[Any, NotImplementedError] =
    literal("welcome") / Routes(
      Method.GET / Root -> handler:
        ZIO.fail(NotImplementedError())
    )

  def run =
    Server
      .serve(routes.sandbox)
      .provide(Server.default)

This code fails to compile with the error:

[error] None of the overloaded alternatives of method / in trait PathCodec with types
[error]  [Env]
[error]   (routes: zio.http.Routes[Env, zio.http.Response])
[error]     (implicit ev: zio.http.codec.PathCodec[Unit] <:<
[error]       zio.http.codec.PathCodec[Unit]): zio.http.Routes[Env, zio.http.Response]
[error]  [B]
[error]   (that: zio.http.codec.PathCodec[B])
[error]     (implicit combiner: zio.http.codec.Combiner[Unit, B]):
[error]       zio.http.codec.PathCodec[combiner.Out]
[error] match arguments (zio.http.Routes[Any, NotImplementedError])
[error]     literal("welcome") / Routes(
[error]     ^^^^^^^^^^^^^^^^^^^^

Describe the solution you'd like

It would be preferable not to force the user to handle the errors at this point and have the above code compile successfully.