Adding code for GA version 2021-12-01 (Azure#26539)

* Adding code for GA version 2021-12-01

Author: rohkuma-microsoft

eng/mgmt/mgmtmetadata/eventgrid_resource-manager.txt

@@ -3,12 +3,13 @@ AutoRest installed successfully.
 Commencing code generation
 Generating CSharp code
 Executing AutoRest command
-cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/eventgrid/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=C:\net1\azure-sdk-for-net\sdk
-2021-06-24 23:13:46 UTC
+cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/main/specification/eventgrid/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=D:\repos\public_sdk\azure-sdk-for-net\sdk
+Autorest CSharp Version: 2.3.82
+2022-01-20 21:08:09 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
-Branch:      master
-Commit:      c2e43f82e91ff7ad691381df56c535164b354cba
+Branch:      main
+Commit:      84c09261f588a7ad29cfb4b46ad7f038f7254275
 AutoRest information
 Requested version: v2
-Bootstrapper version:    autorest@2.0.4413
+Bootstrapper version:    autorest@3.4.1

sdk/eventgrid/Microsoft.Azure.Management.EventGrid/CHANGELOG.md

@@ -1,5 +1,17 @@
 # Release History
 
+## 7.0.0 (2021-12)
+- This release corresponds to api-version 2021-12-01 which includes the following new features:
+    * MSI for delivery to first party destinations.
+    * Support for tracked system topic
+    * Support for Delivery Attributes
+    * Topic type with multiple source scopes.
+    * Support for storage queue message TTL.
+	* MSI for system topics.
+	* Self management of domain topics.
+	* Data plane AAD auth.
+	* User assigned identity for topics and domains.
+	
 ## 6.2.0 (2021-06)
 - This release corresponds to api-version 2021-06-01-preview which includes the following new features:
     * Support of AAD authentication for user topics, domains, and partner namespaces.