Rust has an f16 and bf16 type

[MarkReedZ]

Rust has a crate half that has an f16 and bf16 we could be using. Users would probably be using this?

• https://docs.rs/half/latest/half/index.html

Rust will be adding f16 into the core language.

• https://github.com/rust-lang/rust/issues/116909

The addition of bf16 into the core is tracked here

• https://github.com/rust-lang/rfcs/pull/3451