fix: format global attributes (noir-lang/noir#7401)

chore: box `Closure` in `comptime::Value` enum (noir-lang/noir#7400)
chore: allow opting in to displaying benchmark comments (noir-lang/noir#7399)
chore: box `ExprValue` in `Value` enum (noir-lang/noir#7388)
chore: pull out refactored methods from u128 branch (noir-lang/noir#7385)
feat: require safety comments instead of safety doc comments (noir-lang/noir#7295)