Refactor op/script/component loading and spec validation

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

examples/tests/compute/noop/main.cue

@@ -9,11 +9,3 @@ realempty: {
 empty: {
 	#dagger: compute: []
 }
-
-// additional prop, should not error
-withprops: {
-	#dagger: {
-		compute: []
-		foo: bar: "foo"
-	}
-}

examples/tests/compute/undefined_prop/main.cue

@@ -4,17 +4,14 @@ hello: "world"
 
 bar: string
 
-#dagger: {
-	compute: [
-		{
-			do:  "fetch-container"
-			ref: "alpine"
-		},
-		{
-			do:  "exec"
-			dir: "/"
-			args: ["sh", "-c", "echo \(foo.bar)"]
-		},
-	]
-	foo: bar: bar
-}
+#dagger: compute: [
+	{
+		do:  "fetch-container"
+		ref: "alpine"
+	},
+	{
+		do:  "exec"
+		dir: "/"
+		args: ["sh", "-c", "echo \(bar)"]
+	},
+]