Feat: verify contracts with starkscan

[ivpavici]

Inspired by: https://github.com/martriay/nile-verifer-plugin/blob/main/nile_verifier/main.py

https://starkscan.co/

https://github.com/starkscan/starkscan-verifier

[FabijanC]

What would be the advantages of having starkscan verification integrated into the plugin, compared to using the official CLI tool (https://github.com/starkscan/starkscan-verifier)

[ivpavici]

Hardhat itself supports this feature for Ethereum:
https://hardhat.org/hardhat-runner/docs/guides/verifying

[FabijanC]

It should be noted that we already have this feature for Voyager. I don't know if the API is up to date (because it's included in alpha-goerli tests which we have been skipping for months now). I also don't know how many people are using either Voyager or our CLI command to verify there.