UIO-based handlers produce Route.Handled

[mijicd]

Describe the bug

Creating routes with UIO-based handlers produces instances of Route.Handled, thus making custom error handling via handleErrorCause or handleErrorCauseZIO impossible (e.g., logging the defects, custom error responses, etc.).

To Reproduce

Here's a minimal reproducer:

import zio._
import zio.http._

val route = Method.GET / "test" -> handler((req: Request) => ZIO.debug(s"Received $req").as(Response.ok))

println(route)

Expected behaviour

While the users can mitigate the issue by using one of Handler's constructors and specifying an error type manually, I would expect that handleErrorCause* methods are applicable by default, especially since their docs say:

Handles all typed errors, as well as all non-recoverable errors, by converting them into responses.

[jdegoes]

/bounty $50

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Attempt	Started (GMT+0)	Solution
🟢 @987Nabil		#2596

[algora-pbc]

💡 @987Nabil submitted a pull request that claims the bounty. You can visit your bounty board to reward.

[algora-pbc]

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