Add local channel

[ptristan3]

Summary

Details and comments

Fixes #1608

[kt474]

LGTM just one comment from the original issue - #1608 (comment)

In the refresh method we can add a better error message if the local service is passed in

[jyu00]

I also just noticed that since this would expose the QiskitRuntimeLocalService with this change, we should make its run() method private, because we don't want people to do service.run().

QiskitRuntimeService.run() issues a deprecation message today. But all of our primitives call that method, so wouldn't everyone get that deprecation message? I'm very puzzled as I'm running 0.25 but not seeing the deprecation message. @kt474 do you know what's going on?

[kt474]

QiskitRuntimeService.run() issues a deprecation message today. But all of our primitives call that method, so wouldn't everyone get that deprecation message? I'm very puzzled as I'm running 0.25 but not seeing the deprecation message. @kt474 do you know what's going on?

I believe the way the stacklevels work, the deprecation message will only show up if service.run() is called directly - so the message will not show up when calling service._run() or from within in the primitives. Having said that I should've updated the primitives to also use the private _run method.