Function is_number_float

include/behaviortree_cpp/contrib/json.hpp:20652–20655

@brief return whether value is a floating-point number @sa https://json.nlohmann.me/api/basic_json/is_number_float/

    /// @brief return whether value is a floating-point number
    /// @sa https://json.nlohmann.me/api/basic_json/is_number_float/
    constexpr bool is_number_float() const noexcept
    {
        return m_data.m_type == value_t::number_float;
    }

    /// @brief return whether value is an object
    /// @sa https://json.nlohmann.me/api/basic_json/is_object/