QUnitStateVector and QEngineOCL debugging

A new class QUnitStateVector can hold Schmidt-decomposed representation of state vectors. For now, specifically, it is used only for near-Clifford simulation with QUnitClifford.

A long-standing edge case in QEngineOCL::MAll() has also been fixed.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.9...vm6502q.v9.9.13
v0.8.2...v0.8.4

sha1sum results:
d786df233b4cc10f6f4bb038ad8a1aa5f10dca90 pennylane_qrack-0.8.4-py3-none-macosx_12_0_x86_64.whl
091e2178759a2a7fce6d9f1c866611dc07dd0934 pennylane_qrack-0.8.4-py3-none-macosx_13_0_x86_64.whl
d236ca1b19ea927442fff3418c2e53519c075143 pennylane_qrack-0.8.4-py3-none-macosx_14_0_arm64.whl
14125787a29a72ca75be6517cdbdc1eb5584c683 pennylane_qrack-0.8.4-py3-none-manylinux_2_31_x86_64.whl
97cc18b0e7ff149fc65156534c476b87ef97a8c6 pennylane_qrack-0.8.4-py3-none-manylinux_2_35_x86_64.whl
c01d2ef41dab0a85193f1b0e6475e1b9634256e6 pennylane_qrack-0.8.4-py3-none-manylinux_2_39_x86_64.whl
6bee2238b37890b13834abdea450e4150fe97156 pennylane_qrack-0.8.4-py3-none-win_amd64.whl
8e8af2ac70bc7374422fc4655d2ba039b9333cbc pennylane_qrack-0.8.4.tar.gz