attempt to address next issue:
> when I'm having a lot of websocket connections the node is freezing
and then it needs like 10 mins to sync. Then if I keep pushing requests
it falls out of sync all the time
Refactors filters.go such that map+locks are now in their own class
Move logic for safely canceling & draining channel to its own class
changed subscriptions to ask for size of buffer and construct its own
channel
marked as draft b/c need to do live testing.
