refactor: Move pack/unpack `IP_Port` from DHT into network module. #5051

Job	Run time
docker-bootstrap-node	1m 10s
docker-clusterfuzz	32s
docker-esp32	1m 59s
docker-fuzzer	16s
docker-toxcore-js	2m 4s
docker-win32	19s
docker-win64	26s
docker-bootstrap-node-websocket	16s
	7m 2s

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