feat: verify contract API implementation

[antazoey]

What I did

fixes: #22 fixes: APE-35 Allows user to verify contracts.

Required PR(s):

https://github.com/ApeWorX/ape/pull/1026 https://github.com/ApeWorX/ape/pull/1008

How I did it

Carefully following their API, cross-checking with browser and Hardhat's implementation and Brownie until things worked. Had to make changes in ape-solidity and ape to get it to work.

How to verify it

Checklist

• [x] Passes all linting checks (pre-commit and CI jobs)
• [x] New test cases have been added and are passing
• [x] Documentation has been updated
• [x] PR title follows Conventional Commit standard (will be automatically included in the changelog)

[linear[bot]]

APE-35 Contract code verification on etherscan

[https://github.com/ApeWorX/ape-etherscan/issues/22](https://github.com/ApeWorX/ape-etherscan/issues/22)