cadl -> typespec

<unknown location>:1:1 - warning @cadl-lang/rest/no-routes: Current spec is not exposing any routes. This could be to not having the service namespace marked with @serviceTitle.

// Before
@serviceTitle("Pet Store")
@serviceVersion("v1")
namespace PetStore;

// After
@service({"Pet Store", version: "v1"})
namespace PetStore;

import "@cadl-lang/rest";
import "@cadl-lang/versioning";

using Cadl.Versioning;

@versioned(Versions)
@service({
  title: "Widget Service",
})
namespace DemoService;

enum Versions {
  "v1",
  "v2",
}

using Cadl.Http;
using Cadl.Rest;

model Widget {
  @key id: string;
  weight: int32;
  color: "red" | "blue";
  @added(Versions.v2) name: string;
}

@error
model Error {
  code: int32;
  message: string;
}

interface WidgetService extends Resource.ResourceOperations<Widget, Error> {
  @added(Versions.v2)
  @get
  @route("customGet")
  customGet(): Widget;
}