Implement eth_newFilter and others

[matevz]

SUMMARY

There are two ways to subscribe to listening logs on EVM. The first one is eth_subscribe which is focused on catching events and is already supported by the Oasis Web3 gateway. The second one is eth_newFilter which are triggered when the contract state changes in the logs:
https://docs.metamask.io/services/reference/ethereum/json-rpc-methods/filter-methods/eth_newfilter/

COMPONENT NAME

Oasis Web3 gateway

ADDITIONAL INFORMATION

Calling eth_newFilter is the preferred way for listening events in Web3Py 6.2.x, and onwards.