Implement C-Bindings for polyproto Rust Crate

[bitfl0wer]

To make polyproto easily available in other programming languages, the Rust crate needs C-Bindings implemented via the C-ABI. These bindings will enable seamless integration with languages like C, Python, and more. Please also review #42. The polyproto Rust crate also needs wasm bindings. Please perform refactors and additions with this in mind to reduce or avoid additional refactors in the future.

Tasks:

• 1. Review the polyproto Rust crate for compatibility with C-Bindings.
• 2. Design and implement C-Bindings using Rust’s #[no_mangle] and extern features.
• 3. Document the C API for external developers, including usage examples.
• 4. Test the C-Bindings with at least one external programming language.

Skills Required:
• Rust knowledge.
• Understanding of FFIs/ABIs and bindgen/cbindgen
• Experience with cross-language interoperability.