Move enostr to nostrdb-net

[jb55]

I need some of the network code in notecrumbs. I'm currently using nostr-sdk over there, but the networking code double-parses json in the context of nostrdb. I really just a simple tungstenite wrapper that structurally parses websocket events, but doesn't fully parse them, since we let nostrdb handle that.

enostr currently does this for us in notedeck, but its a bit buggy and doesn't have a proper parser at the moment. Let's move enostr into nostrdb-net