Add wait parameter to prediction creation methods

[mattt]

No description provided.

[aron]

Is the intention here to roll this out quietly via the block param for testing?

[mattt]

Is the intention here to roll this out quietly via the block param for testing?

Sort of. Because of how run wraps createPrediction, we need to make block a parameter to set the right headers in the original request. So most people will continue using replicate.run, but I suppose they could start using predictions.create and opt-in to the same behavior.

[aron]

I think I preferred the version we had that exposed wait here. Where wait was one of:

wait?: { mode: "block", timeout?: number } | { mode: "poll", interval?: number }

This way we have only one param consistently, and it defaults to {mode: "block"}.