support restricted access skus (#13002)

Author: george-moussa

specification/quantum/resource-manager/Microsoft.Quantum/preview/2019-11-04-preview/examples/offeringsList.json

@@ -25,6 +25,7 @@
                   "name": "Standard",
                   "id": "Standard",
                   "description": "Provider CPU and FPGA QIO based solver.",
+                  "restrictedAccessUri": "https://endpoint",
                   "targets": [
                     "p1"
                   ],

specification/quantum/resource-manager/Microsoft.Quantum/preview/2019-11-04-preview/quantum.json

@@ -658,6 +658,10 @@
           "type": "string",
           "description": "Description about this sku."
         },
+        "restrictedAccessUri": {
+          "type": "string",
+          "description": "Uri to subscribe to the restricted access sku."
+        },
         "targets": {
           "type": "array",
           "description": "The list of targets available for this sku.",