Add rotatable BTT_SFS_V2.0 model

[reemo3dp]

Thank you very much for URBI, it's a fantastic mod!
I had issues with filament getting stuck in my SFS2 during feeding. Flipping it around helped, but I had to file away some plastic so it mounts on URBI.

This PR adds a second mounting hole for people whose SFS2 has a similar bias with regards to filament orientation. I didn't modify the rest of URBI, so it doesn't sit exactly flush with the mount.

If you'd like to incorporate it into URBI properly: I just rotated the SFS, realigned the ptfe tube with the coupling and then re-created the hole on the upper part - with 8mm center dist between the slot-in hole and the final position.

[MapleLeafMakers]

This looks like a good idea, thanks for contributing! I want to take some time to test it out after the holidays and see if there's a way to support both orientations, but it'll probably be after the holidays

[reemo3dp]

Sure thing, feel free to also just close this PR and only use it for inspiration. It's working significantly better for me with the orientation swapped, it's a shame the screw holes aren't symmetric 😬