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Specialize `ToString` implementation on `u128` and `i128`
Part of https://github.com/rust-lang/rust/issues/135543.
Follow-up of rust-lang/rust#136264.
When working on https://github.com/rust-lang/rust/pull/142098, I realized that i128 and u128 could also benefit from the ToString specialization so here it.
The last commit is just me realizing that I forgot to add the format tests for usize and isize.