Use dense array types in sparse wrappers.

[maleadt]

Fixes #493

[codecov]

Codecov Report

Merging #495 into master will increase coverage by 0.01%.
The diff coverage is 29.62%.

@@            Coverage Diff             @@
##           master     #495      +/-   ##
==========================================
+ Coverage   80.52%   80.54%   +0.01%     
==========================================
  Files         166      166              
  Lines        8858     8861       +3     
==========================================
+ Hits         7133     7137       +4     
+ Misses       1725     1724       -1     

Impacted Files	Coverage Δ
lib/cusparse/generic.jl	95.40% <ø> (ø)
lib/cusparse/interfaces.jl	33.33% <25.00%> (ø)
test/cusparse.jl	92.29% <66.66%> (-0.15%)	⬇️
lib/cusparse/array.jl	62.64% <0.00%> (+1.14%)	⬆️

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