feat(span): add Atom::r#static

[kermanx]

This allows

const TYPEOF_UNDEFINED: Atom<'static> = Atom::r#static("undefined");

#[derive(Clone, Copy)]
enum Value<'a> {
  /// Not `Atom<'a>`, which takes one more byte
  StringLiteral(&'a Atom<'a>),
  // ...
}

fn get_typeof<'a>(value: Value<'a>) -> Value<'a> {
  if ... {
    return Value::StringLiteral(&TYPEOF_UNDEFINED);
  }
}

[graphite-app]

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[codspeed-hq]

CodSpeed Performance Report

Merging #8479 will improve performances by 3.31%

_{Comparing KermanX:feat/atom-static (daa3752) with main (4071878)}

Summary

⚡ 1 improvements
✅ 31 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	KermanX:feat/atom-static	Change
⚡	semantic[cal.com.tsx]	27.1 ms	26.2 ms	+3.31%