Use TaskGroup to wait on network activating or retry timeout, whichever is first

[jessegrosjean]

I think this addresses #87

[jessegrosjean]

@heckj Also, if you have any idea how to get rid of the for try await _ in group (and see commented code above) let me know. I haven't done much work with async and can't see why one works without warning and the other doesn't.

[heckj]

I'm only reading on an iPad and commenting based on knowledge with this so far - I want to experiment with some variations on the branch tomorrow when I'm more cogent to see if I can get your original desired setup - intentionally racing the two tasks - sorted, as I think that's a lot easier to understand.

[heckj]

failing test appears to be a flake. I'm going to briefly hold merging this to lock down where that flake is happening, then merge this (assuming it is unrelated, which i'll check as i dig it out when I get home)