`flat n` command to view flattened directory tree to specified depth

[knodalyte]

Is your feature request related to a problem? Please describe.
Sometimes I want to see the contents of some or all levels of a directory tree in one view. Ideally I could specify the number of levels to recurse.

Describe the solution you'd like
Ranger has a flat command that takes a parameter that is the recurse level. Something like that would be fine.

Describe alternatives you've considered
Not sure there is a way to accomplish this in clifm now.

Additional context
... And of course all clifm options would be available in the flat view! :-)

[leo-arch]

Duplicate of #191

[knodalyte]

I think what I was requesting is different from #191 but the features you are proposing for that issue would satisfy my needs.

I don't really need to see a tree structure, really looking for flat list (with paths displayed). Not sure if that plays well with screen width in the case of deep trees or long directory or file names.