Expand the instruction set with advanced operations.

[yezzfusl]

1. Expanded the instruction set with new logical operations: and, or, xor, and not.
2. Added shift operations: shl (shift left) and shr (shift right).
3. Implemented a comparison operation cmp that sets flags based on the result.
4. Added jump instructions: jmp (unconditional jump), je (jump if equal), jne (jump if not equal), jg (jump if greater), and jl (jump if less).
5. Introduced a flags register to store comparison results.
6. Modified the decode function to accommodate the expanded instruction set.
7. Added new unit tests to verify the correctness of the new instructions.

[yezzfusl]

The expanded instruction set adds significant functionality, including control flow and more complex arithmetic and logical operations. The new instructions are seamlessly integrated into the CPU emulator.