Handle observation events on frontend

[rbren]

Describe the bug #105 introduced a breaking change to the API. We now emit two types of payloads via the websocket:

{"action": "foo"}

and

{"observation": "bar"}

Where observations are the result of running an action.

The frontend currently doesn't handle the observation events

Steps to Reproduce

1. Run any task in the U
2. Note that command outputs etc are not printed

Expected behavior Properly handle observation events

[rbren]

Partly fixed in: https://github.com/OpenDevin/OpenDevin/pull/185

[rbren]

I believe this is fixed