Support star coloring in decompress_csc!

[blegat]

Implement decompress_csc! for star coloring.
This would remove the need for the hacky workaround in blegat/ArrayDiff.jl#103
This is the equivalent of what #298 did for TreeSetColoring

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.89%. Comparing base (f233ebc) to head (d1e63a9).

Files with missing lines	Patch %	Lines
src/decompression.jl	0.00%	5 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (f233ebc) and HEAD (d1e63a9). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (f233ebc)	HEAD (d1e63a9)
	5	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #353       +/-   ##
===========================================
- Coverage   99.76%   46.89%   -52.87%     
===========================================
  Files          22       20        -2     
  Lines        2541     2499       -42     
===========================================
- Hits         2535     1172     -1363     
- Misses          6     1327     +1321     

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