Group skywire-cli visor subcommands

[0pcom]

We have a lot of subcommands in skywire-cli visor right now. Too many.

It would make sense to group some of these up into one visor subcommand with just additional subcommands or flags.

For example, skywire-cli visor apps should have either additional subcommands or flags for all the app-related subcommands in skywire-cli visor

the subcommands we need under skywire-cli visor are as follows

• app
• rule
• tp
• exec
• pk
• version
• ip

so every visor subcommand (if there is more than one) related to one of the above listed items should be either a subcommand of the subcommand or a flag for the subcommand.