[enh] functions to return shortest path geometries

[knaaptime]

resolves #43

linter also made a handful of formatting changes

[codecov]

Codecov Report

❌ Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (a01e4d6) to head (4eb7a92).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pandarm/network.py	0.00%	30 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #47   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          5       5           
  Lines        297     321   +24     
=====================================
- Misses       297     321   +24     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jGaboardi]

v nice! tests?