Add a simple function for adding curves to a `Curves` data-block.
The only argument is a list of the number of points in each added
curves. Attribute data is meant to be filled in separately.
It can be used like this: `curves.add_curves([8, 8, 16])`, which will
add two curves with 8 points, and one with 16 points. This API is
chosen in order to make the API generic, and to push users to
add more curves at once, rather than appending a single curve
at a time, which would be slower.
Pull Request: https://projects.blender.org/blender/blender/pulls/112400
07f01b5fc2