message: change azureresourceschema to new build
diff: The Azure Resource Schema Generator will generate Azure Resource Schemas for use with Resource Templates.
  -``` yaml $(azureresourceschema)
  +``` yaml $(azureresourceschema) && !isLoaded('@autorest/azureresourceschema')
  use-extension:
  - "@microsoft.azure/autorest.azureresourceschema": "v3"
  + "@autorest/azureresourceschema": "~3.0.0"
  try-require: ./readme.azureresourceschema.md
  ```
  \ No newline at end of file
  