Review diff_fuzzer fuzzer

[JulianGCalderon]

We should:

• Ensure that the fuzzer is up to date: that all the commands work correctly.
• Add more documentation on how to run it, and their requirements.

When trying to run it, I get the following error:

 === Uncaught Python exception: ===
IndexError: list index out of range
Traceback (most recent call last):
  File "/Users/julian/work/cairo-vm/fuzzer/diff_fuzzer/random_hint_fuzzer.py", line 37, in diff_fuzzer
    hint = fdp.PickValueInList(LOADED_HINTS)
IndexError: list index out of range

==83281== ERROR: libFuzzer: fuzz target exited