Add Rust for Linux material

[fw-immunant]

This will probably require a fair bit of discussion and revision, but this is how things stand at present. Notably, this material does not have exercises and might benefit from them to keep students engaged and improve pacing.

I taught this material in essentially this form (minus a couple typo fixes) to a group of around a dozen students with Linux kernel experience but not much Rust background other than the Fundamentals course. I thought things went well but also took some time to loop in some slides from the Concurrency section as a working understanding of Rust concurrency features is necessary to understand some safety patterns employed in the kernel. Maybe we should figure out a way to share slides or add "detours"?

Comments from RfL zulip here.

[fw-immunant]

The code references using the Linux kernel library will have to be disabled for testing, since we probably don't want to take the Linux kernel as a dependency.