Event-scanner doesn't take care about Infura limitations

[roleengineer]

Infura has limit 10000 result for requests.
Event-scanner uses web3.js method for contract instances getPastEvents("allEvents") to fetch events and when even-scanner is running first time it starts {fromBlock: 0}. If event-scanner uses Infura as endpoint and contract already has a lot of logs and the amount of the results is more than 10000, event-scanner stops, because of the unhandled Promise.rejection.
Example that was reproduced with Infura and Testnet Operator contract:

event_scanner    | Contract 0xb3356900d56F39c79Bfdc2b625d15B1b5b9262a9 is at local height 0 (diff: 6266859)
event_scanner    | (node:7) UnhandledPromiseRejectionWarning: Error: Returned error: query returned more than 10000 results

[troggy]

usually we read events in chunks — maybe a quick and dirty solution here as well