* feat(etherscan, middleware): implement gas-related endpoints and use them in gas oracle
* cleanup deps
* better comment
* revertme: add debug print
* Revert "revertme: add debug print"
This reverts commit 63993642c4.
* make etherscan tests serial
* run each etherscan test at least 200ms
* 200ms -> 250ms
* Revert "200ms -> 250ms"
This reverts commit 29c7f6ed9a.
* add separate etherscan key for celo tests
* 200ms -> 250ms
* add Chain::Sepolia to match