Streamline topology exploration

[jdegenstein]

This is an updated version of PR #873 (see discussion there for more context)

The goal of this PR is to streamline topology exploration across the entire codebase. Currently, there are topology exploration methods scattered in several places. The new method is apparently more repeatable in the way it explores topology.

This PR is still very rough as I am still deciding if it is possible to have a single return format that works for all applications, or to keep a few methods (all of which should exist in one central place like shape_core.py).

[codecov]

Codecov Report

Attention: Patch coverage is 85.18519% with 8 lines in your changes missing coverage. Please review.

Project coverage is 96.54%. Comparing base (551cd3b) to head (b311d73).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/build123d/topology/shape_core.py	75.00%	6 Missing ⚠️
src/build123d/exporters3d.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1036      +/-   ##
==========================================
- Coverage   96.63%   96.54%   -0.10%     
==========================================
  Files          32       32              
  Lines       10157    10151       -6     
==========================================
- Hits         9815     9800      -15     
- Misses        342      351       +9     

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