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/azure/resourcegroup/tests/rg.cue

@@ -0,0 +1,17 @@
+package resourcegroup
+
+import (
+	"alpha.dagger.io/azure"
+	"alpha.dagger.io/azure/resourcegroup"
+	"alpha.dagger.io/random"
+)
+
+TestSuffix: random.#String & {
+	seed: "azrg"
+}
+
+TestRG: resourcegroup.#ResourceGroup & {
+	config:     azure.#Config
+	rgName:     "rg-test-\(TestSuffix.out)"
+	rgLocation: "eastus2"
+}