Python support

[adamchalmers]

Add a new cargo feature, 'python', which enables pyo3 bindings on some structs.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@51f8af5). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
modeling-cmds/src/format/fbx.rs	0.00%	6 Missing ⚠️
modeling-cmds/src/format/gltf.rs	0.00%	6 Missing ⚠️
modeling-cmds/src/format/obj.rs	0.00%	6 Missing ⚠️
modeling-cmds/src/format/ply.rs	0.00%	6 Missing ⚠️
modeling-cmds/src/format/step.rs	0.00%	6 Missing ⚠️
modeling-cmds/src/format/dxf.rs	0.00%	3 Missing ⚠️
modeling-cmds/src/format/sldprt.rs	0.00%	3 Missing ⚠️
modeling-cmds/src/format/stl.rs	0.00%	3 Missing ⚠️
modeling-cmds/src/format/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #913   +/-   ##
=======================================
  Coverage        ?   26.64%           
=======================================
  Files           ?       35           
  Lines           ?     1685           
  Branches        ?        0           
=======================================
  Hits            ?      449           
  Misses          ?     1236           
  Partials        ?        0           

Flag	Coverage Δ
unittests	26.64% <0.00%> (?)

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