sage.matrix.operation_table: Modularization and code style fixes

[mkoeppe]

📚 Description

We remove the module-level dependency of sage.matrix.operation_table on matplotlib and sage.plot and fix some code style issues.

It fixes a modularization regression introduced in #8598.

📝 Checklist

• I have made sure that the title is self-explanatory and the description concisely explains the PR.
• I have linked an issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

[codecov-commenter]

Codecov Report

Base: 88.59% // Head: 88.58% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (fb4f6ab) compared to base (fbb4127).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35153      +/-   ##
===========================================
- Coverage    88.59%   88.58%   -0.01%     
===========================================
  Files         2140     2140              
  Lines       396961   396958       -3     
===========================================
- Hits        351677   351656      -21     
- Misses       45284    45302      +18     

Impacted Files	Coverage Δ
src/sage/matrix/operation_table.py	96.58% <100.00%> (+0.91%)	⬆️
src/sage/crypto/util.py	91.37% <0.00%> (-5.18%)	⬇️
src/sage/interfaces/qsieve.py	71.30% <0.00%> (-2.61%)	⬇️
...e/combinat/cluster_algebra_quiver/mutation_type.py	50.83% <0.00%> (-2.14%)	⬇️
src/sage/combinat/combination.py	93.50% <0.00%> (-1.50%)	⬇️
src/sage/modular/hecke/algebra.py	94.65% <0.00%> (-1.07%)	⬇️
src/sage/schemes/elliptic_curves/hom_velusqrt.py	94.09% <0.00%> (-0.79%)	⬇️
src/sage/geometry/cone.py	93.01% <0.00%> (-0.60%)	⬇️
src/sage/schemes/elliptic_curves/cardinality.py	87.00% <0.00%> (-0.40%)	⬇️
src/sage/quadratic_forms/ternary_qf.py	66.73% <0.00%> (-0.39%)	⬇️
... and 13 more

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[tscrim]

Just a few trivial doc formatting things. LGTM otherwise.

[mkoeppe]

Thank you! I've committed these changes.

[tscrim]

Thanks. LGTM.

[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: fb4f6ab

[dimpase]

lgtm.

@Bruno-TT - who wrote that graphic tables code - might want to have a look, but I guess it's all right.

[mkoeppe]

Thanks, Dima!