Stream subscriptions (#18355)

* swarm/network: eachBin now starts at kaddepth for nn

* swarm/network: fix Kademlia.EachBin

* swarm/network: fix kademlia.EachBin

* swarm/network: correct EachBin implementation according to requirements

* swarm/network: less addresses simplified tests

* swarm: calc kad depth outside loop in EachBin test

* swarm/network: removed printResults

* swarm/network: cleanup imports

* swarm/network: remove kademlia.EachBin; fix RequestSubscriptions and add unit test

* swarm/network/stream: address PR comments

* swarm/network/stream: package-wide subscriptionFunc

* swarm/network/stream: refactor to kad.EachConn