Request to update Redis Enterprise version stable/2021-03-01 (#12967)

* Adds base for updating Microsoft.Cache from version preview/2020-10-01-preview to version 2021-03-01

* Updates readme

* Updates API version in new specs and examples

* Add support for persistence and fix other typos

* Fix SDK Warning: R2063 OperationIdNounConflictingModelNames

* Fix spellcheck error

* Fix acronym capitalization in descriptions

* Replace local parameters with common-types parameters

* Use naming convention consistent with Azure documentation

* Update word choice, remove deprecated x-ms-code-generation-setting, and fix operationId

* Add x-ms-secret extension and make TLS version a string enum

* Suppress errors about secrets being sent in responses

* Fix operation typo in example

specification/redisenterprise/resource-manager/Microsoft.Cache/stable/2021-03-01/examples/OperationsStatusGet.json

@@ -8,7 +8,7 @@
   "responses": {
     "200": {
       "body": {
-        "id": "/subscriptions/subid/providers/Microsoft.Cache/locations/westus/operationStatus/testoperationid",
+        "id": "/subscriptions/subid/providers/Microsoft.Cache/locations/westus/operationsStatus/testoperationid",
         "name": "testoperationid",
         "startTime": "2017-01-01T13:13:13.933Z",
         "endTime": "2017-01-01T16:13:13.933Z",