Rollup merge of #146326 - cyrgani:int-module-1, r=jhpratt

simplify the declaration of the legacy integer modules (`std::u32` etc.)

This PR removes some duplicated code from the declaration of the legacy integer modules by expanding the macro which is already used to generate `MIN` and `MAX` to now generate the whole module.
This would also make the remaining steps listed in rust-lang/rust#68490 such as fully deprecating the modules or placing `#[doc(hidden)]` on them easier.