adding az cli command generation (Azure#14623)

* adding az cli command generation

* reverting x-ms-client-flatten for delegated subnet

* address feedback from cli team

* pushing another change

* remove readonly flag

* remove flatten flag

Co-authored-by: Ali Egal <alegal@microsoft.com>

specification/dnc/resource-manager/readme.az.md

@@ -0,0 +1,14 @@
+## AZ
+
+These settings apply only when `--az` is specified on the command line.
+
+``` yaml $(az) && $(target-mode) != 'core'
+az:
+    extensions: dnc
+    namespace: azure.mgmt.dnc
+    package-name: azure-mgmt-dnc
+az-output-folder: $(azure-cli-extension-folder)/src/dnc
+python-sdk-output-folder: "$(az-output-folder)/azext_dnc/vendored_sdks/dnc"
+# add additinal configuration here specific for Azure CLI
+# refer to the faq.md for more details
+```

specification/dnc/resource-manager/readme.cli.md

@@ -0,0 +1,28 @@
+``` yaml
+# add any configuration here for all CLI languages
+# refer to the faq.md for more details
+cli:
+    cli-directive:
+      - where:
+            group: .*
+            parameter: privateLinkResourceId
+        alias:
+            - priv_link_resource_id
+        ## hide an operation
+      - where:
+            group: .*
+            op: Patch
+        hidden: true            
+      - where:
+            group: .*
+            op: PatchDetails            
+        hidden: true   
+      - where:
+            group: .*
+            op: GetDetails
+        name: show
+      - where:
+            group: .*
+            op: PutDetails
+        name: create                          
+```