Sparse CSC

[michel2323]

@amontoison Sorry, I also worked on it yesterday 🙂. This support Complex and throws errors for the trsm etc.

[github-actions]

Your PR no longer requires formatting changes. Thank you for your contribution!

[michel2323]

For the complex cases, I can also post a warning that performance is degraded due to additional allocation. I think it might still be valuable in some cases.

[codecov]

Codecov Report

❌ Patch coverage is 80.80000% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.74%. Comparing base (3d3278d) to head (9040ac3).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/mkl/wrappers_sparse.jl	85.47%	17 Missing ⚠️
lib/mkl/interfaces.jl	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #528      +/-   ##
==========================================
+ Coverage   79.70%   79.74%   +0.04%     
==========================================
  Files          45       45              
  Lines        2818     2943     +125     
==========================================
+ Hits         2246     2347     +101     
- Misses        572      596      +24     

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[amontoison]

@michel2323 Is it fine for you to merge my PR before and then rebase your PR on top of it?
It will be easier to review for me.