Get OctoPrint working with the MK4 for remote control and camera

Highly related: https://github.com/geerlingguy/3d-printing/issues/9

Prusa, I'm sure, would love for me to use PrusaLink / [Prusa Connect](https://connect.prusa3d.com), and I may try them out... but I love me some OctoPrint, and there's a guide: [Octoprint setup on MK4/ MK3.9 / MK3.5 / XL](https://help.prusa3d.com/guide/octoprint-setup-on-mk4-mk3-9-mk3-5-xl_646395).

So I would like to minimally get OctoPrint working with the MK4, and mount up a Pi Camera Module 3 on the side somewhere permanent, along with a Pi 4 or Pi 5.

I'm aware there may be a few issues with print speed... I would like to do some testing and see if those concerns are well-founded. Supposedly the USB serial connection maxes out at 115200 baud or something. It'd be nice to _not_ have a print get bogged down in serial comms!

If all else fails, I would at least like to get a Pi Camera Module 3 wired up and connected to PrusaLink (which runs local on the printer). It'd be _super cool_ if OctoPrint could be like Klipper where you kinda just jam it into the MK4 for a complete printer takeover :D