Improvements on Sparse API.

[AndPotap]

Now the sparse API requires row_indices, col_indices and data which makes it easier for the user to construct the Sparse operator. This is the COO "ijv" format. Since this format is not the most efficient for matrix-multiplication, it is then internally transformed to the CSR format which is what the API was asking the user before.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.33%. Comparing base (d9e12c0) to head (19a88e9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
+ Coverage   83.13%   83.33%   +0.19%     
==========================================
  Files          41       41              
  Lines        3516     3534      +18     
==========================================
+ Hits         2923     2945      +22     
+ Misses        593      589       -4     

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