Inlines knots_num() and adds an inlined utility function for computing
the total number of points in a nurbs curve. This should avoid potential
code duplication and allows behavior to be searched for.
Named function 'control_points_num()' to differentiate from the
'points_num' variable (referencing the number of unique points).
Pull Request: https://projects.blender.org/blender/blender/pulls/140248
9e2e90e8ce