Fix broken checkbounds for CuSparseMatrixCSR and tests

[achuchmala]

Hi,

I fixed the checking bounds for CuSparseMatrixCSR and added tests for CuSparseMatrixCSR and CuSparseMatrixCSC.

[maleadt]

Thanks! The CUSPARSE tests belong in test/cusparse.jl though.

[achuchmala]

Whoops... sorry for that, I didn't notice proper location of tests :/

[codecov]

Codecov Report

Merging #545 (d311b03) into master (e09bf71) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #545      +/-   ##
==========================================
+ Coverage   77.83%   77.95%   +0.12%     
==========================================
  Files         116      116              
  Lines        6415     6414       -1     
==========================================
+ Hits         4993     5000       +7     
+ Misses       1422     1414       -8     

Impacted Files	Coverage Δ
lib/cusparse/array.jl	64.08% <100.00%> (+4.19%)	⬆️

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