Replace static-assertions with const fn expressions

[StackOverflowExcept1on]

File Location(s)

static-assertions crate has not been supported for the last 4 years, but as of Rust 1.57 we can do the same in a constant context: https://internals.rust-lang.org/t/nicer-static-assertions/15986

Proposal

- static_assertions::foo!()
+ const _: () = assert!(FOO == BAR);