feat: add wait tool implementation for collab

[jif-oai]

Add implementation for the wait tool.

For this we consider all status different from PendingInit and Running as terminal. The wait tool call will return either after a given timeout or when the tool reaches a non-terminal status.

A few points to note:

• The usage of a channel is preferred to prevent some races (just looping on get_status() could "miss" a terminal status)
• The order of operations is very important, we need to first subscribe and then check the last known status to prevent race conditions
• If the channel gets dropped, we return an error on purpose