sage.topology: Move imports from sage.graphs, sage.homology into methods

[mkoeppe]

📚 Description

Part of:

• Meta-ticket: Modularize sagelib into separate distributions (pip-installable packages) sagemath-... for Sage 10.x #29705

📝 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

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (c00e6c2) 88.62% compared to head (8d79ca8) 88.60%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #35263      +/-   ##
===========================================
- Coverage    88.62%   88.60%   -0.02%     
===========================================
  Files         2148     2148              
  Lines       398855   398855              
===========================================
- Hits        353480   353412      -68     
- Misses       45375    45443      +68     

Impacted Files	Coverage Δ
src/sage/topology/cubical_complex.py	95.56% <100.00%> (ø)
src/sage/topology/delta_complex.py	94.51% <100.00%> (ø)
src/sage/topology/simplicial_complex_morphism.py	90.36% <100.00%> (ø)
src/sage/topology/simplicial_set.py	95.67% <100.00%> (ø)
src/sage/topology/simplicial_set_constructions.py	89.34% <100.00%> (ø)
src/sage/topology/simplicial_set_examples.py	95.07% <100.00%> (ø)
src/sage/topology/simplicial_set_morphism.py	91.59% <100.00%> (ø)

... and 31 files with indirect coverage changes

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[dcoudert]

LGTM.

[mkoeppe]

Thank you!

[github-actions]

Documentation preview for this PR is ready! 🎉
Built with commit: 8d79ca8