Pyqrack

A number of "reduced density matrix" expectation value calculation methods have been added to both the static and shared library API. The point of these methods, only relevant to Clifford+RZ stabilizer simulation, is that they trace out a "reduced density matrix" excluding ancillary qubits for non-Clifford phase gadgets, instead of fully incorporating the non-Clifford phase effects. This makes these methods very fast and very low-memory, but they constitute approximations to the actual expectation values, were non-Clifford effects fully included.

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**Full Changelog**: https://github.com/unitaryfund/pyqrack/compare/v1.18.6...v1.19.0

This release adds the methods `clone()` and `inverse()` to the `QCircuit`/`QrackCircuit` API. (`Inverse()` produces a clone of the circuit that is the exact inverse of the original circuit.)

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In previous patches, for "weak sampling mode," if an ancilla collapsed into |1> state, a correction was applied by replacing the injected phase gate with its inverse. This happened to work for `T` gates, but it was not correct: rather, the gate should corrected with an additional `Z` gate. This should improve weak sampling mode fidelity, again.

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All C++ Qrack unit tests currently pass for `--enable-weak-sampling` with the exception of `test_mirror_circuit` and `test_mirror_qcircuit`, which are not necessarily expected to pass due to the fact that they exceed Clifford+RZ gate set. (Qrack should automatically detect the deviation from the intended "weak sampling" gate set, in the ideal, hence this might be a target area for improvement, for next steps.)

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A major fidelity improvement has been made in the "weak sampling" algorithm for Clifford+RZ gate set, particularly with QUnit optimization layer, which now works with weak sampling.

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Several minor bugs and edge cases were fixed since v1.18.1. (They might not even effect "weak sampling" in practice.)

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