Add storageRedundancy property to Synapse v3 database GET and PUT (Azure#13425)

* add storageRedundancy to get and create properties

* undo update properties change

* add enum storage redundancy type

Author: chzachar

specification/synapse/resource-manager/Microsoft.Synapse/preview/2020-04-01-preview/sqlDatabase.json

@@ -285,6 +285,24 @@
             "create"
           ]
         },
+        "storageRedundancy": {
+          "description": "Storage redundancy of the database.",
+          "enum": [
+            "Geo",
+            "GeoZone",
+            "Local",
+            "Zone"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "SqlDatabaseStorageRedundancyType",
+            "modelAsString": true
+          },
+          "x-ms-mutability": [
+            "read",
+            "create"
+          ]
+        },
         "maxSizeBytes": {
           "format": "int64",
           "description": "The max size of the database expressed in bytes.",