[Core] aaz: Support to use cli_ctx to initiate AAZCommand class

src/azure-cli-core/azure/cli/core/aaz/_command.py

@@ -87,17 +87,24 @@ def _build_arguments_schema(cls, *args, **kwargs):
         #     schema.generic_update_force_string = AAZGenericUpdateForceString()
         return schema
 
-    def __init__(self, loader):
+    def __init__(self, loader=None, cli_ctx=None, **kwargs):
+        """
+
+        :param loader: it is required for command registered in the command table
+        :param cli_ctx: if a command instance is not registered in the command table, only cli_ctx is required.
+        """
+        assert loader or cli_ctx, "loader or cli_ctx is required"
         self.loader = loader
         super().__init__(
-            cli_ctx=loader.cli_ctx,
+            cli_ctx=cli_ctx or loader.cli_ctx,
             name=self.AZ_NAME,
             confirmation=self.AZ_CONFIRMATION,
             arguments_loader=self._cli_arguments_loader,
             handler=True,
             # knack use cmd.handler to check whether it is group or command,
             # however this property will not be used in AAZCommand. So use True value for it.
             # https://github.com/microsoft/knack/blob/e496c9590792572e680cb3ec959db175d9ba85dd/knack/parser.py#L227-L233
+            **kwargs
         )
         self.command_kwargs = {}