@key in todoApp spec

[ArcturusZhang]

There are a few use cases of @key @visibility("read") for id property in the create body in todoApp spec, for example:

• typespec-e2e-demo/todoApp/spec/main.tsp

  Line 21 in ae71e18

  id: safeint;

• typespec-e2e-demo/todoApp/spec/main.tsp

  Line 46 in ae71e18

  @visibility("read") @key id: safeint;

Because the operation is not using a template, all emitters are treating the property as if there is no @key.
Therefore in the client side test cases, we do not even have a way to put the id into the request - the path does not have that parameter, and in body, it has visibility("read") therefore it should not appear in the body.
Now we have a very weird situation that the server is expecting the id value, but on the client side, we have no way to put it into the request.