Add option to add command output to quickfix list

[Hubro]

It might be nice to add the output of a command to the quickfix list.

It seems like this should be very simple with the setqflist function. Very nice example here, using the configured 'errorformat':

https://phelipetls.github.io/posts/async-make-in-nvim-with-lua/

There are probably challenges here:

• Considering that the command is run in a proper terminal, how are ANSI escape codes handled? Would it be a good idea to pipe commands through cat if this option is enabled?

• How to set this option? It would be a pain to create a new user command for every possible permutation of options. Perhaps I can add a system of flags prefixing the command, something like:

  :Splitrun (new) (quickfix) make test
  

  This would force a new split and flag that the output should be added to the quickfix list.