Specify decompression in one triangle directly from the routine coloring

[amontoison]

close #280

-- BREAKING CHANGES --

• Pass the keyword argument decompression_uplo directly in coloring.
• We can do the decompression in one triangle on GPU for star coloring.
• Vectorized decompression for star coloring in one triangle.
• Less storage if we do the decompression in one triangle for star and acyclic colorings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.27%. Comparing base (e951ff2) to head (9d2c6f6).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
+ Coverage   99.17%   99.27%   +0.09%     
==========================================
  Files          22       22              
  Lines        2304     2331      +27     
==========================================
+ Hits         2285     2314      +29     
+ Misses         19       17       -2     

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[amontoison]

@gdalle It is ready for a review.