Add decompress_row! and decompress_column!

[amontoison]

• Add decompress_row! and decompress_column!
• Fix a typo in the docstring of decompress_rows! and decompress_rows

cc @gdalle

[codecov]

Codecov Report

Attention: Patch coverage is 66.03774% with 18 lines in your changes missing coverage. Please review.

Project coverage is 93.79%. Comparing base (83a1330) to head (949b93a).

Files	Patch %	Lines
src/decompression.jl	66.03%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   97.81%   93.79%   -4.02%     
==========================================
  Files           9        9              
  Lines         366      419      +53     
==========================================
+ Hits          358      393      +35     
- Misses          8       26      +18     

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[gdalle]

I understand the purpose of this, but for now let's keep it on the back burner. It is conceptually simpler to reason in terms of full matrices, and when we move to smaller colorings that require linear systems, we'll need the full matrix anyway.

I have opened #30 to keep track and discuss further.

[gdalle]

This no longer fits within the new framework, closing while we figure out if we really need it (note that it wouldn't work with substitution decompression)