improve speed of separable spectral cone oracles

[chriscoey]

No description provided.

[codecov]

Codecov Report

Merging #768 (f48bb1a) into master (58e367c) will decrease coverage by 0.01%.
The diff coverage is 97.43%.

@@            Coverage Diff             @@
##           master     #768      +/-   ##
==========================================
- Coverage   91.90%   91.88%   -0.02%     
==========================================
  Files          53       53              
  Lines        8000     7996       -4     
==========================================
- Hits         7352     7347       -5     
- Misses        648      649       +1     

Impacted Files	Coverage Δ
src/Cones/epipersepspectral/matrixcsqr.jl	99.73% <97.43%> (-0.27%)	⬇️

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