Codegen handwritten geo methods (as much as possible)

[aaron-skydio]

For the geo classes, move as many methods as possible from "Handwritten methods" to "Custom methods", like Rot3::ToRotationMatrix. Probably also want a way to do this for python, and possibly camera classes.

See also #80

[aaron-skydio]

@bradley-solliday-skydio is this done? At least for c++? (If it’s done for c++ but not python we should mark this as done and ~make another issue if we don’t already have an issue for Python-c++ parity~ the other component of C++/Python parity is #23 )

[aaron-skydio]

Yes, this is effectively done - additional things here will become new issues