Clean-up library wrappers [NFC]

[maleadt]

cc @kshyatt

[codecov]

Codecov Report

Merging #334 into master will decrease coverage by 0.71%.
The diff coverage is 80.97%.

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
- Coverage   79.44%   78.73%   -0.72%     
==========================================
  Files         156      158       +2     
  Lines        8908     8755     -153     
==========================================
- Hits         7077     6893     -184     
- Misses       1831     1862      +31     

Impacted Files	Coverage Δ
lib/cusparse/CUSPARSE.jl	100.00% <ø> (ø)
lib/cusparse/util.jl	87.50% <ø> (+27.50%)	⬆️
lib/library_types.jl	18.64% <0.00%> (-19.29%)	⬇️
test/cublas.jl	91.66% <ø> (ø)
test/cusolver.jl	100.00% <ø> (ø)
test/cusparse.jl	93.22% <ø> (ø)
lib/cusparse/types.jl	39.47% <39.47%> (ø)
lib/cusolver/util.jl	50.00% <50.00%> (-50.00%)	⬇️
lib/cublas/util.jl	89.47% <55.55%> (-10.53%)	⬇️
lib/cusparse/wrappers.jl	77.46% <74.50%> (-5.24%)	⬇️
... and 6 more

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