cuSolver QR

[j9263178]

We can add internals for cusolverDngeqrf() (or cusolverDnXgeqrf()), within it we might need cusolverDnorgqr() to generate Q from Householder vectors.

[j9263178]

cuSolver uses column major so we always need to do some transpose to get the desired result with cusolverDngeqrf() and cusolverDnorgqr(), maybe it is better we use Xgelqf and Xorglq when those are supported by cuSolver in the future.