adaptation of donation-leaderboard for parallele

[geleeroyale]

This was originally built in April 2018 as an easy deployable solution for people to setup a no-frills site where people can send transactions with an attached message to have the sum of transactions from one address grouped and added up and displayed in descending order - usually called leaderboard.

The different branches of /giveth/donation-leaderboard are different implementations where funds were raised for certain projects and events. For example see https://leaderboard.giveth.io

Current status of the project is broken. Following things need a fix:

• Etherscan dropped their websocket endpoint. So we should replace etherscan websockets and while at it the whole request with another "more open provider" - i.e. blockscout ... i.e. use blockscout graphQL endpoint
• Metamask seems to be intitializing properly, but transactions are not propagated to wallet. Needs update because original was built with an old web3 version.
• Add support for tokens.