Update matrix_to_dicts and fix generalized_degree

[eriknw]

Now matrix_to_dicts can return either the node id or row or column index.

Of course we'd like more tests and coverage with this... but we'd like that lots of places! ;)

[codecov-commenter]

Codecov Report

Base: 73.20% // Head: 72.99% // Decreases project coverage by -0.20% ⚠️

Coverage data is based on head (d896e4a) compared to base (58cdf50).
Patch coverage: 36.36% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   73.20%   72.99%   -0.21%     
==========================================
  Files          67       67              
  Lines        2314     2322       +8     
  Branches      430      436       +6     
==========================================
+ Hits         1694     1695       +1     
- Misses        462      466       +4     
- Partials      158      161       +3     

Impacted Files	Coverage Δ
graphblas_algorithms/classes/_utils.py	72.41% <30.00%> (-3.50%)	⬇️
graphblas_algorithms/nxapi/cluster.py	77.55% <100.00%> (ø)

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