Support negated targets in stim collapsing gates#3455
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This PR implements support for the following operations:
M !0,MX !0,MY !0,MR !0,MRX !0,MRY !0,MZZ !0 1,MXX !0 1,MYY !0 1,where M, MZ; MR, MRZ are interchangeable,
and on pair measurements we can negate either target, or both, but the negation will invert the result by the XOR of both negations. For example:
MZZ !0 1=MZZ 0 !1MZZ !0 !1=MZZ 0 1In terms of the implementation, all that had to be done was adding an X gate before and after the emitted M operations (all collapsing gates are eventually decomposed to a single M in a qubit). For measurement reset operations, we only add the X gate before the measurement (as we don't care about post-measurement state).