Add gemini agent implementation; Add missed requirements; Minor fix some small bugs

mm_agents/gpt_4v_prompt_action.py

@@ -237,7 +237,7 @@ for example, format as:
 ```
 
 REMEMBER:
-For every step, you should only return the action_type and the parameters of your action as a dict, without any other things. 
+For every step, you should only RETURN ME THE action_type AND parameters I ASKED FOR. NEVER EVER RETURN ME ANYTHING ELSE.
 You MUST wrap the dict with backticks (\`).
 You MUST choose and ONLY CHOOSE from the action space above, otherwise your action will be considered as invalid and you will get a penalty.
 You CAN predict multiple actions at one step, but you should only return one action for each step.