[FEA] Use cuBLAS's hermitian transpose if hermitian operator is used

[cliffburdick]

As commonly done in signal processing code a user can do:

matmul(c, a, hermitian(b));

But this is not currently possible since you cannot pass an operator into matmul. Instead, a user must make a temporary copy of the hermitian'd matrix into another tensor, then call matmul. Instead, we can detect if this is a primary hermitian operator and pass this to the underlying GEMM library rather than adding the extra copy.