Input for syscall is one memory pointer to the state array of 25 gl fe.
Output is calculated in place.
All functions outside of keccakf are executed in Rust. Might need to
delete everything except keccakf from keccakf.asm (including the
padding, updating, and byte <-> u64 conversions).
Not tested. Should I wait till all infrastructure needed are merged?
Technically can also do the following for the machine and I think I can
test it already?
```
pol commit input_state[25];
pol commit output_state[25];
operation keccakf_permutation<0> input_state[0], input_state[1], ..., input_state[24] -> output_state[0], output_state[1], ..., output_state[24]
array::zip(input_state, output_state, |input_state, output_state| (keccakf(input_state) - output_state = 0);
```
4bd1f1dfb6