Integration for mdfind on MacOS

[kekscode]

Is your feature request related to a problem? Please describe.
On the CLI in MacOS it is possible to use the system-wide desktop search using mdfind for like mdfind <partial-file/partial-path>. It also supports various flags to narrow down the search. It would be cool to have that in telescope because why not using what the OS provide as a well-supported, fast and efficient facility to find files all over the disk(s).

Example:

$> mdfind "restic sh"      
/Users/<redacted>/devops/github.com/restic/restic/doc/Makefile
/Users/<redacted>/devops/github.com/restic/restic/doc/_static/css/restic.css
/Users/<redacted>/devops/github.com/restic/restic/doc/bash-completion.sh
/Users/<redacted>/devops/github.com/restic/restic/doc/conf.py
/Users/<redacted>/devops/github.com/restic/restic/doc/zsh-completion.zsh
/Users/<redacted>/devops/github.com/restic/restic/docker/build.sh
/Users/<redacted>/devops/github.com/restic/restic/helpers/verify-release-binaries.sh
/Users/<redacted>/Backups/restic-mount.sh
/Users/<redacted>/Backups/restic-check-prune-stats.sh

I checked https://github.com/nvim-telescope/telescope.nvim/wiki/Extensions and if i did not overlook something, there is not an extension yet and https://github.com/search?q=mdfind%20telescope&type=repositories didn't yield much interesting stuff, too. Did I overlook something obvious?

I am aware that this is not a cross-platform thing, so it is maybe not a feature for the default telescope package. I just would like to know if i 1) have not found an already existing solution/extension/configuration or 2) jump in and try to provide it, because i think it may be useful for me and others alike.

Describe the solution you'd like
Essentially the same behaviour as Find Files does.

Describe alternatives you've considered
Open a terminal buffer inside neovim and just type in the mdfind and then e.g. use gf.