Feat/#2696 response to request metadata

[DaneEvans]

Add response for metadata request.

Working, The only question is if it's worth this amount of overhead.
Will run spotless and detekt on it after initial review.

[jamesarich]

I like that this opens the door for other potential calls w/ callbacks that we can surface. I do wonder if the reaction/dialog should happen at a higher level, there's potential for a metadata request from the node list longpress menu too

[jamesarich]

playing w/ this just gave me flashbacks from callback hell - i'm wondering if there's a way to tackle this in a more reactive/unidirectionally flowing way

[DaneEvans]

I was wondering if we just set a flag - expecting a callback from (traceroute, nodenum)
And if we get a matching packet within 60 seconds, we do the popup then.

It wouldn't block UI, it'll reset fine if it doesn't get a response, it's more generalised etc