Cleanup inputs, outputs and proxy

Superceded by Client API.

Signed-off-by: Helder Correia <174525+helderco@users.noreply.github.com>

tests/plan/with/with.cue

@@ -5,9 +5,9 @@ import (
 )
 
 dagger.#Plan & {
-	inputs: params: foo: string
-
 	actions: {
+		params: foo: string
+
 		_image: dagger.#Pull & {
 			source: "alpine:3.15.0@sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3"
 		}
@@ -25,7 +25,7 @@ dagger.#Plan & {
 			}
 
 			direct: {}
-			params: env: FOO: inputs.params.foo
+			"params": env: FOO: params.foo
 		}
 	}
 }