Function basic_json diff

include/behaviortree_cpp/contrib/json.hpp:24281–24412

@brief creates a diff as a JSON patch @sa https://json.nlohmann.me/api/basic_json/diff/

    /// @brief creates a diff as a JSON patch
    /// @sa https://json.nlohmann.me/api/basic_json/diff/
    JSON_HEDLEY_WARN_UNUSED_RESULT
    static basic_json diff(const basic_json& source, const basic_json& target,
                           const std::string& path = "")
    {
        // the patch
        basic_json result(value_t::array);

        // if the values are the same, return empty patch
        if (source == target)
        {
            return result;
        }

        if (source.type() != target.type())
        {
            // different types: replace value
            result.push_back(
            {
                {"op", "replace"}, {"path", path}, {"value", target}
            });
            return result;
        }

        switch (source.type())
        {
            case value_t::array:
            {
                // first pass: traverse common elements
                std::size_t i = 0;
                while (i < source.size() && i < target.size())
                {
                    // recursive call to compare array values at index i
                    auto temp_diff = diff(source[i], target[i], detail::concat(path, '/', std::to_string(i)));
                    result.insert(result.end(), temp_diff.begin(), temp_diff.end());
                    ++i;
                }

                // We now reached the end of at least one array
                // in a second pass, traverse the remaining elements

                // remove my remaining elements
                const auto end_index = static_cast<difference_type>(result.size());
                while (i < source.size())
                {
                    // add operations in reverse order to avoid invalid
                    // indices
                    result.insert(result.begin() + end_index, object(
                    {
                        {"op", "remove"},
                        {"path", detail::concat(path, '/', std::to_string(i))}
                    }));
                    ++i;
                }

                // add other remaining elements
                while (i < target.size())
                {
                    result.push_back(