Sourcify plugin for hardhat
npm install hardhat-sourcifyrightnow it's a simple version works for single contract.
plan to improve it to:
1. simplify the inputs
2. support verify multiple contracts
sourcify is already used by hardhat-deploy :/ so I have to change to a new task name. may change to a simpler task name if i can come up with one :D
```
yarn hardhat sourcifySubmit --contract-name "Greeter" --source-name "contracts/Greeter.sol" --address 0xxxxxxxxx --chain-id 3
use yarn hardhat help sourcifySubmit` to see the help for the task