feat: add x86 RDRAND instruction hook

[Jvlegod]

Hello maintainers,

This PR close #1902

We have support UC_X86_INS_RDTSC, now this PR adds UC_X86_INS_RDRAND's hook.

[PhilippTakacs]

The API you propose is a bit limited. I would expect a way to change the generated random. Your change just call the hook and after that use the normal implementation. So there is no simple way to change the result.

[Jvlegod]

I would expect a way to change the generated random.

I have now added a hook that executes after the instruction successfully completes.

This hook allows for controlling the CF flag (indicating whether the instruction succeeded) and modifying the random value.

The CF flag is set according to the result (see the “Operation” section above). The OF, SF, ZF, AF, and PF flags are set to 0.

• https://www.felixcloutier.com/x86/rdrand