Euler angle single qubit layers, for benchmarks

[WrathfulSpatula]

It takes 3 layers of single qubit gates, in the affected benchmarks, to produce a general single qubit unitary gate. Instead, we treat the single bit layers as potential Euler angle compositions. This is more expensive, but it's likely more representative of a useful use case, such as for general matrix multiplication with a QC.

[WrathfulSpatula]

2 and 3 qubit gates are basically single Euler axis, and not continuous like for some of these single bit layers. It would be expedient to have 3 single qubit Euler angles, but perhaps this is out of proportion. In any case, I'm reconsidering.