Deleted Contains function from the utils.go file.
Replaced bufio.ReadWriter with io.Reader and io.Writer respectively.
Updated PubSub module to remove posibility of not passing a channel name when subscribing or publishing.
Moved server cluster receiver functions into cluster.go.
Moved keyspace receiver functions into keyspace.go.
Moved module and command loading into modules.go.
Updated Dockerfile and docker-compose to remove http flag to server.
Renamed raft_layer directory to raft.
Created snapshot and aof packages to handle snapshots in standalone mode and aof package to handle append-only function.
Created server package that will contain the server logic.
