Function basic_json from_msgpack

Source/external/json.hpp:23565–23575

	/// @sa https://json.nlohmann.me/api/basic_json/from_msgpack/
	template<typename InputType>
	JSON_HEDLEY_WARN_UNUSED_RESULT
	static basic_json from_msgpack(InputType&& i,
								   const bool strict = true,
								   const bool allow_exceptions = true)
	{
		basic_json result;
		detail::json_sax_dom_parser<basic_json> sdp(result, allow_exceptions);
		auto ia = detail::input_adapter(std::forward<InputType>(i));
		const bool res = binary_reader<decltype(ia)>(std::move(ia), input_format_t::msgpack).sax_parse(input_format_t::msgpack, &sdp, strict);
		return res ? result : basic_json(value_t::discarded);
	}

	/// @brief create a JSON value from an input in MessagePack format
	/// @sa https://json.nlohmann.me/api/basic_json/from_msgpack/