Only look for transfers after the first block that contains erc20 transfers

[yenda]

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Problem

Since looking for transfers is expensive because getting events has to be done by iterating over a range of blocks, we could reduce the amount of blocks to iterate over by stopping once the first block containing erc20 transfers is reached

Implementation

• start looking for erc20 transfers from any address to any address from block 0 and iterate until an erc20 transfer is found.
• use the block number of the first transfer as a starting point
• I propose we only have this hardcoded value for mainnet

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