compute matrix kernels modulo composites

[yyyyx4]

Fixes #34862.

[codecov-commenter]

Codecov Report

Base: 88.58% // Head: 88.58% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (fe50906) compared to base (293dd72).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #34968      +/-   ##
===========================================
- Coverage    88.58%   88.58%   -0.01%     
===========================================
  Files         2140     2140              
  Lines       396961   396961              
===========================================
- Hits        351655   351654       -1     
- Misses       45306    45307       +1     

Impacted Files	Coverage Δ
...c/sage/geometry/polyhedron/ppl_lattice_polytope.py	96.52% <ø> (ø)
src/sage/interfaces/qsieve.py	71.30% <0.00%> (-2.61%)	⬇️
src/sage/graphs/generators/random.py	91.26% <0.00%> (-1.03%)	⬇️
src/sage/modular/modform/numerical.py	94.19% <0.00%> (-0.65%)	⬇️
src/sage/sets/integer_range.py	91.41% <0.00%> (-0.51%)	⬇️
src/sage/graphs/generic_graph.py	89.12% <0.00%> (-0.40%)	⬇️
src/sage/schemes/elliptic_curves/cardinality.py	87.00% <0.00%> (-0.40%)	⬇️
src/sage/graphs/graph_plot.py	84.33% <0.00%> (-0.29%)	⬇️
src/sage/schemes/elliptic_curves/ell_generic.py	93.23% <0.00%> (-0.14%)	⬇️
src/sage/graphs/digraph.py	92.58% <0.00%> (-0.13%)	⬇️
... and 12 more

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[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: c028ed7

[yyyyx4]

Thanks for the review!