Etherscan FETCH_TRANSACTIONS cache

[leovigna]

Find a solution to cache the FETCH_TRANSACTIONS request and update relevant values using middleware.

• BLOCK/SET/TIMESTAMP: The Etherscan tx indexing API returns the block timestamp which we can update without having to fetch the block
• Transaction.meta add metadata on latestBlockNumber: {[networkId-address]: <value>} which tracks the max blocknumber a tx from/to address was recorded. This can then be used to update FETCH_TRANSACTIONS request to fetch from latestBlockNumber as the block range.