* fix: and optimising fetching membership events
* fix: start from lastProcessedBlock+1
* test: fetching membership logic
* refactor: usage of rlnInstance,rootTracker,groupManager
rlnInstance, rootTrack were previously created while creating rlnRelay
but were assigned to groupManager on Start of rlnRelay. This created
unncessary dependency of passing them to static and dynamic group
manager.
Web3Config uses interface EthClientI for client, so that we can pass
mock client for testing MembershipFetcher.
* fix: failing test
* fix: lint error
* fix: account for PR suggestions
* fix: failing race test
* fix: dont' increase fromBlock on error
* nit: fix naming and add comments
Richard Ramos
harsh jain