cue modules: move stdlib to pkg/alpha.dagger.io

In preparation for Europa, we will vendor multiple CUE modules:

- `pkg/alpha.dagger.io`: legacy non-europa packages
- `pkg/dagger.io`: core Europa packages
- `pkg/universe.dagger.io`: Europa universe

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

pkg/alpha.dagger.io/graphql/graphql.cue

@@ -0,0 +1,39 @@
+package graphql
+
+import (
+	"encoding/json"
+
+	"alpha.dagger.io/dagger"
+	"alpha.dagger.io/http"
+)
+
+#Query: {
+	// Contents of the graphql query
+	query: string
+	// graphql variables
+	variable: [key=string]: _
+	// graphql url
+	url: string
+	//API Token
+	token: dagger.#Input & dagger.#Secret | *null
+
+	post: http.#Post & {
+		"url": url
+		request: {
+			body: json.Marshal({
+				"query":   query
+				variables: json.Marshal(variable)
+			})
+			header: "Content-Type": "application/json"
+			token: token
+		}
+	}
+
+	payload: {
+		data: {...}
+		errors?: {...}
+	}
+	payload: json.Unmarshal(post.response.body)
+	data:    payload.data   @dagger(output)
+	errors?: payload.errors @dagger(output)
+}