Support conflux

[benluelo]

The conflux etherscan api returns slightly malformed (although technically correct) data in responses:

https://evmapi-testnet.confluxscan.io/api?module=contract&action=getabi&address=0x1aed8ea8bc4023f2a9520843ae41273efb88da5b

{"status":"0","message":"contract 0x1aed8ea8bc4023f2a9520843ae41273efb88da5b not verified"}

note that the result key is missing.

I'm seeing the issue here: https://github.com/foundry-rs/block-explorers/blob/main/crates/block-explorers/src/contract.rs#L373

Not sure what the best way to fix this would be, happy to submit a PR once that's figured out.

EDIT: ConfluxScan is a lot older than I thought, and has been archived for ~4 years: https://github.com/Conflux-Chain/conflux-scan. I've hit a lot of other issues with their apis, so feel free to close this issue since I think it's likely not worth the time to fix.