[Feature]: support git sparse checkouts

[tionis]

Description

At the moment larger repos have to be checked out fully, especially for repos with many files or manu larger media files using lfs this can be infeasible.

Describe the solution you'd like

This is mostly useful in combination with #319.
Git sparse checkouts allow specifying specifics directories or patterns that should be checkout out, ignoring the other files.
Together with LFS support, this would enable syncing larger repos without downloading all large files.

Describe alternatives you've considered

No response

[ViscousPot]

I appreciate these ideas and I'm currently considering implementation options. 👍🏾 Also focussing on new codebase open-sourcing at the moment so this may take some time. Definitely good thoughts though, thank you :)

[ViscousPot]

Blocked on this
libgit2/libgit2#2263