Related to issue #216

[Miska05]

• Added validation for Ethereum addresses using the EIP-55 checksum standard.
• Implemented the validate_eth_address function to ensure all Ethereum addresses are correctly validated before use.
• Updated the Account::new constructor to include checksum validation logic.
• Included test cases to verify the correctness of valid and invalid Ethereum addresses.
• Improved error handling for invalid addresses.

[CLAassistant]

All committers have signed the CLA.

[sdankel]

Please update the title to something meaningful and link the issue in the PR description.

[JoshuaBatty]

Closing: Feel free to reopen here https://github.com/FuelLabs/forc if you wanted to continue with the PR.