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/.dagger/env/git-repo/values.yaml

@@ -0,0 +1,26 @@
+plan:
+    package: ./git/tests/git
+name: git-repo
+inputs:
+    TestPAT:
+        secret: ENC[AES256_GCM,data:SvsXkYYhHr89mL1Szg5vDJVemUXVkZvz8g697jTmt2ug61rrDD2ipA==,iv:a7pRsZvawsxqWXPvqCMilOoLdHwdG85m48FkD6ACSh4=,tag:8xkQ/ESO0oqtv99eAPfjdw==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age1gxwmtwahzwdmrskhf90ppwlnze30lgpm056kuesrxzeuyclrwvpsupwtpk
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBRVm9VbnZLQzl0LzBjYUkw
+            cXBwTlJWeXpCellCenJFcEFBejVGREpIaVdZCkV1U3BMK1BUOStvUThUd09DVUNK
+            OXJ4Yjl4WEtSMHlpeG5TVUNwQU5iMXcKLS0tIE1HS0U0YWxYS3V5UXFmUUxTVGlk
+            TmhJNisyamw3d244aGVJSEVFVUVLZGsKvd+nowA0CLXQbdvyI4J0lBjs9vdISWlo
+            gGvR49uul3Z8raVWXFUzsyQ8xTvYNg0ovynFG2KdagSKr1DlhKMBEQ==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2022-01-03T17:42:22Z"
+    mac: ENC[AES256_GCM,data:sbdzqKrYToYjG44St3I/TeYGVowCTFmzMGvf0EASAtRApo5Zj04Ezv7yoNwMq+hzTky9PUxLhpjhXTUzKCDP70NE3XzJlYm0f4GK4H75/oZ28++kg8O9I0lUPES/Vrmeg5qwYEqoS5J5B5bYWLDBXMnBZxDTkOzSXUCgcrg60vU=,iv:s9c5tRvaROW30Zwc5U+W7qBtFH7C/OBa3ZF9c9yioYI=,tag:ZYI2Xbg2PMBsonrFo6OhMA==,type:str]
+    pgp: []
+    encrypted_suffix: secret
+    version: 3.7.1