feat: Implement Banking System Features and Tests

[Cogbonnia]

• Added functionality for handling various types of accounts.
• Implemented logging for account operations.
• Enhanced error handling and validation for account actions.
• Developed unit tests for each class to ensure reliability and correctness.

Authored by: Chelsea

[Cogbonnia]

I skipped some of the instructions and ended up doing all four requirements. It’s not the worst, but don’t expect that level of effort from me every time.