refactors and cleanup

[tabcat]

• [x] Replace src/storage with a util that just makes handling Datastores easier. (does the same thing but just as a util instead of a class.
• [x] Swap out node's EventEmitter with the standardized EventTarget

[tabcat]

Going to use https://github.com/libp2p/js-libp2p-interfaces/blob/master/packages/interfaces/src/events.ts for now