[Feature]: push-based model for starting the project

[utterstep]

Describe the feature

Currently the project start command in the cargo-shuttle CLI will send requests to the gateway in a loop to get the status of the project until it is ready (or crashed/errored), showing a spinner until it concludes. This is a pull-based model.

It would be more efficient to refactor this to a push-based model, meaning we setup a websocket connection in the gateway that we connect to when we call project start, and then we show the spinner until we receive a message on the websocket with a final state (ready, crashed, errored).

Suggestion or Example of how the feature would be used

No response

Duplicate declaration

• [X] I have searched the issues and this feature has not been requested before.

[utterstep]

@vroussea started working on this one :)