feat: Add implementation support for forge clone

### Component Forge ### Describe the feature you would like `forge clone 0xC02aB1A5eaA8d1B114EF786D9bde108cD4364359 sparklend-usds` will pull just the proxy code, but would be much more useful to be able to pull the implementation code as well, maybe with a flag? ### Additional context _No response_