Constified to Rustified Converter

Defaulting to using constified enums makes sense when dealing with C libraries, given that Rust has undefined behavior in the event of the C library expanding its enum.

However, when doing development on the rust end, it is nice to be able to have facilities like #[derive(Debug)] or exhaustive match.

I'd like to request an option to generate both a Rustified enum and a constified enum, use the constified representation in the library interface, and provide EnumName::from_constified(k: u32) -> Option<EnumName> or similar function to represent a possibly failing (if the const is out of range) translation to a Rustified enum.

I think this could get us the best of both worlds. It avoids undefined behavior, but still allows the use of a more Rust-like data structure with an explicit place to catch the error.

(I'd tag this Enhancement if I could, it's not a bug)

Start by locating the enum-generation paths that handle Rustified and constified representations. Trace how generated enums are exposed through the binding interface, then define the option and conversion behavior requested here. Done means both representations can be generated, the interface remains constified, and conversion from a constified value can report an invalid value.