This commit adds an option to interpolate the number of control points in new curves based on the count in neighboring existing curves. The idea is to provide a more automatic default than manually controlling the number of points in a curve, so users don't have to think about the resolution quite as much. Internally, some utilities for creating new curves are extracted to a new header file. These can be used for the various nodes and operators that create new curves. The top-bar UI will be adjusted in a separate patch, probably moving all of the settings that affect the size and shape of the new curves into a popover. Differential Revision: https://developer.blender.org/D14877