[draft] Optimism support

[pyk]

Add Optimism verification support for foundry.

This PR is in progress, wait for new Official ethers is released with Optimism support.

gakonst/ethers-rs#737

TODO (pyk): Add example contract here verified using foundry

[pyk]

Btw I tried to deploy & verify the simple contract to optimism but got the following error:

Not sure what cause the error tho, coz the gas fee estimator on Optimism Kovan is working fine.

here is the command that I use:

forge create src/Foundry.sol:Foundry --private-key <PK> --rpc-url https://kovan.optimism.io

[pyk]

Update: Successfully deploy contract to Optimism Kovan, but blocked by #311 when verifying.

https://kovan-optimistic.etherscan.io/address/0x51421a04483f4006ceeb66cb2c917f9699ef7419

[gakonst]

Doing a cargo update -p ethers will pull in the PR from ethers.

I think that always enabling the legacy feature is not the best way forward here, the "right" way to do it is to check the network type and call .legacy() on the .deploy() call, i.e. factory.legacy().send()

[pyk]

I will close this and open new PR