Allow using 0 to auto-select tcp/udp port

[arnetheduck]

Specifying 0 as port should make nimbus let the OS pick a port and subsequently use it in ENR/libp2p/etc

See also waku-org/nwaku#2125

[cheatfate]

This issue is complex to implement, because if you bound TCP socket to 0 port you will get random available TCP port, but its does not guarantee you that if you bind to UDP socket to 0 port you will get same UDP port. It also possible that if you will bound to 0 only TCP socket and try to reuse randomly generated port to UDP socket it could become busy, so this process could take some time to get equal random TCP/UDP port.