feat: Add error handling for cryptographic operations

[crStiv]

Changes

• Added custom error types for cryptographic operations
• Implemented input parameter validation for public keys
• Added validation for Ethereum addresses
• Improved error handling during key generation
• Added signature verification

Testing

• Verified key generation with invalid parameters
• Verified address validation
• Verified handling of invalid signatures

Closes #348

[joshuasing]

Thanks for taking the time to contribute, however at this time we feel these changes are unnecessary. The ethereum package contains Ethereum-related utilities for the rest of the codebase to use, and each function contained within is required by another package in the repository.

Additionally, this pull request does not compile due to it changing functions (and attempting to override the existing PublicKeyToAddress function) that are used within other packages. Error messages within this repository also must contain English characters only.

We have decided to close this for now, however please feel free to create new pull requests if you think there are other parts of the codebase we can improve. Thanks again.