Optimize event parsing #178
Description
Viem's parseEventLogs is very inefficient and grows exponentially slower with increased ABI size and logs amount. Refactor _filteredEvents to not use parseEventLogs. Option is to filter for all ABIs in _events, so that it's only done once for all subscribers. And have a memoized toFunctionSelector and/or map from selector to ABI item to ameliorate the slowest part, which is parsing/hashing the ABI.