Should we remove the timeout from ActorProxy by default

[rynowak]

Describe the proposal

ActorProxy uses a default HttpClient which comes with a 100 second timeout. This might be surprising, because users can add their own cancellation policies, but can't be more permissive than what the built-in timeout supports.

We're adding other mechanisms to give users control over this, but I wanted to raise the topic specifically - should we remove the default timeout? Have you been impacted by this?

[fbridger]

This may be silly question but... is there any way to determine if an Actor with a specific Id is Idle or Busy?

It might be nice to have a way to know the current state of an Actor before doing the call and hitting this timeout. Right?