Introduce StridedCuArray

[maleadt]

Fixes #432

[codecov]

Codecov Report

Merging #435 into master will increase coverage by 0.07%.
The diff coverage is 85.18%.

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
+ Coverage   79.55%   79.63%   +0.07%     
==========================================
  Files         170      170              
  Lines        9157     9148       -9     
==========================================
  Hits         7285     7285              
+ Misses       1872     1863       -9     

Impacted Files	Coverage Δ
src/array.jl	91.32% <ø> (ø)
src/subarray.jl	82.60% <0.00%> (-3.76%)	⬇️
lib/cublas/wrappers.jl	92.27% <78.57%> (+1.30%)	⬆️
lib/cublas/linalg.jl	95.58% <100.00%> (ø)
test/cublas.jl	88.81% <100.00%> (ø)

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