swarm: Chunk refactor (#17659)

cmd/swarm/hash.go

cmd/swarm/swarm-smoke/main.go

cmd/swarm/swarm-smoke/upload_and_sync.go

swarm/api/api.go

swarm/api/config.go

swarm/api/http/server_test.go

swarm/api/manifest.go

swarm/fuse/swarmfs_test.go

swarm/network/fetcher.go

swarm/network/fetcher_test.go

swarm/network/priorityqueue/priorityqueue.go

swarm/network/priorityqueue/priorityqueue_test.go

swarm/network/simulation/simulation.go

swarm/network/stream/common_test.go

swarm/network/stream/delivery.go

swarm/network/stream/delivery_test.go

swarm/network/stream/intervals_test.go

swarm/network/stream/messages.go

swarm/network/stream/peer.go

swarm/network/stream/snapshot_retrieval_test.go