Support pydata/sparse 0.13 on Python 3.7

[alugowski]

Also test against latest python-graphblas, and add a layout argument to describe().

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d3a4911) 93.44% compared to head (6b3b432) 93.44%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #8   +/-   ##
=======================================
  Coverage   93.44%   93.44%           
=======================================
  Files          11       11           
  Lines         488      488           
=======================================
  Hits          456      456           
  Misses         32       32           

Files	Coverage Δ
matspy/adapters/__init__.py	89.39% <100.00%> (+0.33%)	⬆️
matspy/adapters/graphblas_impl.py	89.74% <ø> (-0.74%)	⬇️
matspy/adapters/numpy_impl.py	100.00% <100.00%> (ø)
matspy/adapters/scipy_impl.py	100.00% <ø> (ø)
matspy/adapters/sparse_impl.py	100.00% <100.00%> (ø)

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