1) according to the spec there are other states we can handle in wait_for_run function, so I added those.
2) added termination msg param.
3) register_reply using invoke_assistant and check_termination_and_human_reply in order, so we can check for exit/human reply for human_input_mode != "NEVER". Remove the hardcoded human_input_mode.
4) return empty array if while loop terminates for some reason without returning messages from the state machine (while loop)

I recieved
```
openai.BadRequestError: Error code: 400 - {'error': {'message': "1 validation error for Request\nbody -> role\n  value is not a valid enumeration member; permitted: 'user' (type=type_error.enum; enum_values=[<RoleParam.USER: 'user'>])", 'type': 'invalid_request_error', 'param': None, 'code': None}}
```

When using message["role"] which uses "assistant" for send messages but the API assumes only user role coming into new messages in thread. Not sure how it works for you without this change?

…ole for end state msgs

logging level based on errors/cancellations.

Remove extra message on failure. Remove last error message on success.

only show last error casted to string in content for last error

1) remove is_termination_msg
2) add external run cancellation
3) remove _wait_for_run and internalize through _get_run_response
4) process responses through _process_messages