add 2021-07-01 swagger (Azure#14854)

* add 2021-07-01 swagger

* update swagger

* update folders

* update to support Azure/azure-sdk-for-net#22576

* remove preview items+introduce apiversion

* address comments

* run prettier-check

* fix CI

* re-add changes from old preview swagger

* address comments

* add missing example

Co-authored-by: Anne Loomis Thompson <annelo@microsoft.com>

Author: shahzzzam

specification/containerregistry/data-plane/Azure.ContainerRegistry/readme.md

@@ -26,6 +26,13 @@ These settings apply only when `--tag=package-2019-08` is specified on the comma
 input-file: preview/2019-08-15-preview/containerregistry.json
 ```
 
+### Tag: package-2021-07
+
+These settings apply only when `--tag=package-2021-07` is specified on the command line.
+
+``` yaml $(tag) == 'package-2021-07'
+input-file: stable/2021-07-01/containerregistry.json
+```
 ---
 # Code Generation