Connection to interprocess-traits and shmem

[asajeffrey]

https://github.com/standard-ai/interprocess-traits has very similar traits ProcSync and ProcSend. They are different though, because usize is ProcSync but not SharedMemRef.

[asajeffrey]

cc @nagisa and @lovesegfault

[asajeffrey]

https://www.youtube.com/watch?v=3NVev3FhGgk

[asajeffrey]

c.f. standard-ai/interprocess-traits#3

[asajeffrey]

The shmem crate is now open source, yay! https://github.com/standard-ai/shmem

[asajeffrey]

c.f. standard-ai/caring#2