Symmetric coloring and decompression for Hessians

[gdalle]

DI source

• Replace the previously used column coloring and decompression with a more efficient (in terms of number of HVPs) symmetric coloring and decompression, introduced by SparseMatrixColorings v0.3.2

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.81%. Comparing base (b262365) to head (ff55100).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #272   +/-   ##
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  Coverage   96.81%   96.81%           
=======================================
  Files          72       72           
  Lines        3740     3740           
=======================================
  Hits         3621     3621           
  Misses        119      119           

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