Add direct sparse gpu constructors for COO, CSC, CSR and BSR matrices

[nHackel]

See here for more infromation. I've yet to add tests, but I'll do so if the API in GPUArrays.jl is considered suitable

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.07%. Comparing base (e2eab84) to head (f9c2af8).

Files with missing lines	Patch %	Lines
lib/cusparse/array.jl	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3022      +/-   ##
==========================================
+ Coverage   76.02%   76.07%   +0.04%     
==========================================
  Files         148      148              
  Lines       12906    12914       +8     
==========================================
+ Hits         9812     9824      +12     
+ Misses       3094     3090       -4     

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