Pyqrack

The code change in this release is extremely small. However, this small change makes a critical difference in execution time of "near-Clifford" benchmarks, motivating the release.

Previously, `CZ` (and "`AntiCZ`") gates always made a "phase-sensitive" check and update of overall `QStabilizer` phase factor. This can be extremely costly, and failure to limit the check to just the case where the "phase-sensitive" option is actually demanded was purely a matter of oversight. This change can reduce the execution time of 64/64(x2)/64(x2) width/depth/"magic" near-Clifford mirror circuit by over a day or more, to a matter of hours on one of our test machines.

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QStabilizerHybrid` creates, maintains, consumes, and "disposes" of gadget ancillae during "Clifford+RZ" gate set usage, but Qrack's `Dispose()` method (which basically performs the inverse of a Kronecker product on substates on throws away one presumably separable subsystem) isn't supported by `QStabilizer` for all separable state vectors, specifically when non-unitary measurement previously became involved in the circuit, ("mid-circuit").

During the collapse of ancillary qubits, for the approximate "rounding" near-Clifford mode, `Dispose()` can't be used as a general fix-all for management and disposal of collapsed `QStabilizer` ancilla qubits, (even if it can for state vector). However, we can still preserve "consumed" ancilla qubits in |0> state, and reuse them generally as new ancilla qubits, upon demand.

This release "debugs the algorithm" of `QStabilizeHybrid`, so as to observe this (previously known, but momentarily forgotten) limitation of `QStabilizer::Dispose()` (and `QStabilizer::Decompose()`). In effect, this limitation of `Dispose()` only seems to come into play for approximate methods, not "ideal" ones, (which makes sense, as the exact methods demand a stronger condition for ancilla mutual collapse relations, and might tend to leave the Clifford representation in the default set of state representations `QStabilizer::Dispose()` can handle, when no mid-circuit measurement is involved).

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In v1.20.6, there was a small problem with comparison between `QStabilizer` instances, with `SumSqrDiff()` or `ApproxCompare()`, due to reliance on comparing stabilizer generator representations, which are degenerate in state vector equivalent (up to global phase). This has been fixed. `QBdt` now also uses fewer `Swap()` operations, internally, to handle multiply-controlled gates.

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QStabilizer::ApproxCompareHelper()` now distinguishes between unitary and "mid-circuit measurement" optimal logic cases, improving both logical generality and performance of methods including `ApproxCompare()` and `SumSquareDiff()` (for comparison of different equal-width simulator states by inner product between them).

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This release fixes a bug in setting the environment variable for "non-Clifford rounding," for GetAmplitude() and ProbAll(). It also adds performance improvements.

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Some critical bugs and edge cases in Clifford+RZ simulation have been fixed, including in the usage of environment variable `QRACK_NONCLIFFORD_ROUNDING_THRESHOLD`.

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