Add basic I/O operations for virtual devices.

[yezzfusl]

1. A new io.rs file that implements the IOController and IODevice trait.
2. The ConsoleDevice struct implements basic console I/O operations.
3. The CPU struct now includes an IOController.
4. Two new instructions, input and output, have been added to interact with I/O devices.
5. The main.rs file has been updated to create an IOController and pass it to the CPU.
6. A MockIOController has been added for testing purposes.
7. Additional tests have been added to verify the correctness of I/O operations.

[yezzfusl]

Basic I/O operations are well-integrated,