feat: add pause and resume jetstream consumer

[yordis]

closes #1569

[yordis]

I need help with:

1. What should be the final public API (should I remove resume and expect people to call Pause with the time.Now())
2. Verify that the payload is correct by not allowing nil time

[ripienaar]

In jsm.go - that is the underlying library for the CLI I added:

• PauseUntil(deadline time.Time) as a create option to create the consumer paused
• Pause(deadline time.Time) to pause a already created consumer
• Resume() to resume a paused consumer
• IsPaused() on a consumer - which I now notice I forgot to add

CLI got:

  consumer pause    Pause a consumer until a later time
  consumer resume   Resume a paused consumer

So seems good to me to have pause and resume behaviors in APIs, the original ask from the server was to have a Resume API also but we decided to take a bit of a shortcut with the nil time behavior. I think client facing be good to have Pause/Resume both.

[yordis]

Hey guys, any update over here?

[piotrpio]

Great work, LGTM!

I changed the target branch to v2.11-dev since we don't want to merge to main until the feature is released on the server.

[yordis]

Waiting to be merge so I move to the Elixir version