Rewrite in Rust

Even though CargOS developers have demonstrated that Rust isn't an ideal choice for kernel development, its potential benefits for enhancing security and robustness in user-space software shouldn't be overlooked. Thus, it's advisable to rewrite `init` in Rust and develop an implementation of the Rust standard library specifically tailored for CargOS.

Begin with the existing init entry point and CargOS requirements; the issue names no files or tests. Determine the scope of rewriting init in Rust and implementing a tailored Rust standard library before estimating the work. Done would require agreed design and acceptance criteria, which the issue does not provide.

Written by the indexing model from the issue text.