swarm/storage/feeds: Final package rename and moved files

.github/CODEOWNERS

cmd/swarm/feeds.go

cmd/swarm/feeds_test.go

swarm/OWNERS

swarm/api/api.go

swarm/api/client/client.go

swarm/api/client/client_test.go

swarm/api/http/server.go

swarm/api/http/server_test.go

swarm/api/manifest.go

swarm/pss/notify/notify.go

swarm/storage/feeds/binaryserializer.go

swarm/storage/feeds/binaryserializer_test.go

swarm/storage/feeds/cacheentry.go

swarm/storage/feeds/doc.go

swarm/storage/feeds/error.go

swarm/storage/feeds/feed.go

swarm/storage/feeds/feed_test.go

swarm/storage/feeds/handler.go

swarm/storage/feeds/handler_test.go