feat(am-dbg): add --client-list file.txt for a live detailed dump

[pancsta]

With a large list of clients, especially tagged ones, it's way easier to browser it in a plain text file. It refreshes
automatically to match the current one in the TUI. Useful for searching for peer IDs and addresses within tags.

Using --client-list am-dbg.txt will create am-dbg.txt in CWD.

ps-TestExposingMany-p0-root   R|85+
  #pubsub:TestExposingMany
  #peer:12D3KooWKBTjhWff2Vd1xbW41duMp5hJmZsBnfGrcNz4vL7XNpuy
- ps-rand-p1-0-065a            |0
    #pubsub-worker
    #src-id:rand-p1-0
- ps-rand-p1-1-41b0            |0
    #pubsub-worker
    #src-id:rand-p1-1
- ps-rand-p1-2-ab80            |0
    #pubsub-worker
    #src-id:rand-p1-2
- ps-rand-p3-0-7408            |0
    #pubsub-worker
    #src-id:rand-p3-0
- ps-rand-p3-1-8476            |0
    #pubsub-worker
    #src-id:rand-p3-1
- ps-rand-p3-2-2787            |0
    #pubsub-worker
    #src-id:rand-p3-2
- ps-rand-p4-0-1f7e            |0
    #pubsub-worker
    #src-id:rand-p4-0
- ps-rand-p4-1-5590            |0
    #pubsub-worker
    #src-id:rand-p4-1
- ps-rand-p4-2-74d8            |0
    #pubsub-worker
    #src-id:rand-p4-2
- ps-rand-p5-0-3728            |1
    #pubsub-worker
    #src-id:rand-p5-0
- ps-rand-p5-1-e61a            |1
    #pubsub-worker
    #src-id:rand-p5-1
- ps-rand-p5-2-fc37            |1
    #pubsub-worker
    #src-id:rand-p5-2

ps-TestExposingMany-p1        S|102+
  #pubsub:TestExposingMany
  #peer:12D3KooWJ6a95r7XZrHXJ8YonNH3xnwWgfdEpcPDTTmEv2Ypdh9Z
- ps-rand-p3-0-831a            |0
    #pubsub-worker
    #src-id:rand-p3-0
- ps-rand-p3-1-c081            |0
    #pubsub-worker
    #src-id:rand-p3-1
- ps-rand-p3-2-1248            |0
    #pubsub-worker
    #src-id:rand-p3-2
- ps-rand-p4-0-370b            |0
    #pubsub-worker
    #src-id:rand-p4-0
- ps-rand-p4-1-4909            |0
    #pubsub-worker
    #src-id:rand-p4-1
- ps-rand-p4-2-069f            |0
    #pubsub-worker
    #src-id:rand-p4-2
- ps-rand-p5-0-783d            |1
    #pubsub-worker
    #src-id:rand-p5-0
- ps-rand-p5-1-a73f            |1
    #pubsub-worker
    #src-id:rand-p5-1
- ps-rand-p5-2-9d04            |1
    #pubsub-worker
    #src-id:rand-p5-2