Add interfaces for jwt-cpp compatibility

[aligirayhanozbay]

I want to extend the jwt-cpp library so it has reflect-cpp compatibility. The interfaces exposed by reflect-cpp are already almost compatible with the traits expected by jwt-cpp, but a small addition to rfl::Object is needed so that it exposes a std::size_t count(const key_type& key) const method. This PR adds that methd.

[gemini-code-assist]

Summary of Changes

Hello @aligirayhanozbay, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to enhance the compatibility of the "reflect-cpp" library with the "jwt-cpp" library. The core change involves adding a specific method to "rfl::Object" that is required by "jwt-cpp"'s expected traits. This addition will allow for seamless integration between the two libraries, enabling "reflect-cpp" objects to be used directly with "jwt-cpp" functionalities.

Highlights

• jwt-cpp Compatibility: Added a new method, "std::size_t count(const key_type& key) const noexcept", to the "rfl::Object" class in "include/rfl/Object.hpp". This method returns 1 if the key is found and 0 otherwise, fulfilling a requirement for "jwt-cpp"'s traits.

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[gemini-code-assist]

Code Review

This pull request adds a count method to rfl::Object to improve compatibility with the jwt-cpp library. My review identifies a correctness issue with the implementation of this new method. It currently only checks for the existence of a key, rather than counting all occurrences, which is misleading for a container that supports duplicate keys. It also has an unintended side effect and an incorrect noexcept specifier. I've provided a suggestion for a more correct and robust implementation.

[liuzicheng1987]

@aligirayhanozbay thanks for the contribution!