swarm: remove unused/dead code (#18351)

cmd/swarm/flags.go

swarm/api/api.go

swarm/api/client/client.go

swarm/api/storage.go

swarm/api/testapi.go

swarm/api/uri_test.go

swarm/network/bitvector/bitvector.go

swarm/network/protocol.go

swarm/network/protocol_test.go

swarm/network/stream/intervals/store_test.go

swarm/network/stream/stream.go

swarm/network/stream/syncer.go

swarm/pot/address.go

swarm/pot/pot.go

swarm/state.go

swarm/state/dbstore.go

swarm/storage/chunker.go

swarm/storage/database.go

swarm/storage/error.go

swarm/storage/ldbstore.go