Add repeated-S-injection experiment

[MarcSerraPeralta]

The circuit for injecting an S gate is:

which has been derived using the steps in ref1.

The circuit has been checked that it works correctly:

[MarcSerraPeralta]

I need to double check if I can run this experiment with stim, because the logical outcomes of the logical ancilla measurement are 50%-50% random. I also need to think what would be the logical observable(s), because the Paulo X correction habe to be applied in software (no window decoder (yet?)).