[WIP] App/Services showing ports subcommand skywire-cli visor ports

[mrpalide]

Did you run make format && make check? Yes

Fixes #1404

Changes:

• add new subcommand to skywire-cli as skywire-cli visor ports to list of all involved ports
• add new methods GetAppPort and SetAppPort to app-cl
• add flag to show all/running ports, running ports as default and --all flag will show all ports

How to test this PR:

• run visor
• run skywire-cli visor ports

Screenshot:
lsof

skywire-cli visor ports

[0pcom]

since we have a way of getting the ports from the visor now, perhaps change everywhere we have used a hardcoded reference to the hypervisor UI such as in the skywire-cli vpn ui & url and skywire-cli hv ui & url to instead fetch this port via the visor rpc. If the port is not found because the visor isnt running, we can just open to or print the default 8000

[0pcom]

The ports for apps shown in the config are not the actual ports which are bound to / listened on.

Is it random for these? It just binds to any open port above 1000?