Filter logs by individual tasks

[agilgur5]

When running a set of tasks simultaneously, sometimes I only care about the logs of a specific task.

For instance, in Argo Workflows, if I'm working on the Server, the logs of the Controller are usually not relevant to me.

Right now you can only see all logs at once and only filter by debug/info/warn/error log levels.

Notably, I actually thought that's what the number input controlled when I first used Kit, because Workflows's make start UI=true runs exactly 4 processes.

Related to #54, a k9s-style terminal UI with gocui, tview, or similar would make this UX fairly straightforward

[agilgur5]

Recently discovered mprocs, which seems to do exactly this TUI-style filter