sparse * sparse fixes

[alyst]

• Fix sparse * sparse overload was not constrained to the matrices with BlasFloat eltype
• Fix special * special: these overloads were not generated, but the unit tests have not detected this error, because in those tests the matrices were not made special (fixed now)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.57%. Comparing base (fec49ef) to head (cfb5cb2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   44.39%   44.57%   +0.18%     
==========================================
  Files           8        8              
  Lines        1489     1494       +5     
==========================================
+ Hits          661      666       +5     
  Misses        828      828              

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[ViralBShah]

Merge?

Please do tag a new release too.

[amontoison]

Thank you @alyst 👍