Add Optimism Ecotone Support

[cgewecke]

214

(Thought this was going live on the 18th per #174 but it was moved ahead at some point.)

Issues

• eth_blobBaseFee isn't available from the Etherscan API
• eth_feeHistory from Alchemy does not include baseFeePerBlobGas

The endpoints are being added in a PR at geth: https://github.com/ethereum/go-ethereum/pull/29140 and scheduled for the 1.14.0 release

Test with:

$ curl -k https://eth-mainnet.g.alchemy.com/v2/API_KEY -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"eth_feeHistory","params":[4, "latest", [25, 75]],"id":1}'

Current Response

{
  "jsonrpc":"2.0",
  "id":1,
  "result": {
    "oldestBlock":"0x128880e",
    "reward":[["0x10c8ffa","0x77359400"],["0x10c8ffa","0xb2d05e00"],...["0x59682f00","0x1b42cbece"]],
    "baseFeePerGas":["0xe25844507","0xdc6dc8ce2","0xd31c9b2d7","0xdc3bfa810","0xc90a4c69e"],
    "gasUsedRatio":[0.39545245932653234,0.3309277088658616,0.6728477666666667,0.1513883]
  }
}

Update

• Have read the scalars from Optimism's GasOracle and updated the constants file with them. (They're nothing like what docs said they'd be couple weeks ago?)
• The oracle's blobBaseFee is coming back as 1 which results in ~10% inflation of the observed cost on Etherscan - am returning a hardcoded .1 to compensate because there's no other info source atm.
• When the real price is available from an endpoint, will need to update to fetch it.
• Pinning viem to 2.7.4 temporarily in this PR because the internal types seem like they have a lot of changes from minor to minor version. We're using their utils.

TODO:

• Make sure L1 baseFee is changed to L1 blobBaseFee in the tables.
• Update images for README and release
• Sanity check numbers on Etherscan