Proposal: create a directory sage/topology and move some of the files currently in sage/homology: move cell_complex.py, cubical_complex.py, delta_complex.py, and simplicial_*.py. Also move examples.py and rename it to simplicial_complex_examples.py or similar.

CC: @tscrim @yuan-zhou

Component: algebraic topology

Author: John Palmieri

Branch: f641bbb

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/31925