introduce mode commands to python client

satrs/src/mode.rs

@@ -179,6 +179,14 @@ impl From<GenericTargetedMessagingError> for ModeError {
 
 pub trait ModeProvider {
     fn mode_and_submode(&self) -> ModeAndSubmode;
+
+    fn mode(&self) -> Mode {
+        self.mode_and_submode().mode()
+    }
+
+    fn submode(&self) -> Submode {
+        self.mode_and_submode().submode()
+    }
 }
 
 pub trait ModeRequestHandler: ModeProvider {