feat: Automate Contract Verification with Hardhat

[gr8h]

This PR introduces a new feature for automated verification of smart contracts using the Hardhat framework.

Technical Details

• A new Hardhat script 4_verify_contracts.js has been added to handle the verification of contracts.
• Updated hardhat.config.js to include necessary configurations for custom chains fuse & spark

[sweep-ai[bot]]

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• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.