[FR] List files from OctoPrint to printer to select one for printing

[KimmoHop]

Is your feature request related to a problem? Please describe.

Slice a print. Upload to OctoPrint. Go to printer. Turn it on and clean the bed. Go back to computer. (I'm skipping connection, because in the way I'm proposing it has to be handled with e.g. Portlister plugin.) Start a print. Go back to printer. See it homes and starts fine :)

I'd like to cut this so I don't have to go back to computer & forth to printer, but I could list newest files from the printer and select which one to start.

Are you looking for hardware support?

Nope

Describe the feature you want

Similar to action:prompt* except reverse: the user initiates the action on printer UI, receives a list of filenames (options) which are shown to the user and user can select one or none of those. Selection index is sent back to host (OctoPrint, are there others?), which starts a print job with selected file.

I'm at this stage interested what the protocol between host and printer could look like? I would assume that the list should be fairly short (last N added files?) to keep printer side simple. Or some sort of paging system.
If such protocol could be plausible for both OctoPrint and Marlin, I'm slightly willing to look into it.

Minimum change would be to add new action, similar to action:start (selected file), but to start printing the newest file uploaded to host.

Additional context

No response