WIP: feat: add strict types to boundaries and semantics

[HideBa]

Pull Request Overview

Summary of Changes

This Pull Request introduces strict typing to boundaries and semantics, leveraging Rust's strong type system. The current implementation utilizes the Value type, which can represent any data type, resulting in ambiguity for users of this library.

Benefits

• Enhanced Type Safety: By implementing stronger typing, users will benefit from improved type safety, leading to fewer runtime errors and more predictable code behavior.
• Simplified Integration with CityJSON: Users will no longer need to create their own implementation to interpret CityJSON's boundaries and semantics fields internal structure, as the library will now provide clearer and more robust type definitions.

Conclusion

These improvements will significantly enhance the usability and robustness of the library, making it easier for developers to work with CityJSON data in a type-safe manner.