This patch replaces the old sockets with a new, random type.
Spline sampling is a very necessary feature for any data. Entering
a spline index is important because users most often perceive
them as isolated objects and global interpolation was considered
a strange solution that had several problems:
Accuracy on large curves.
Difficulty finding offsets. ...
And also, the global nature of the input length used to make it
impossible to transfer data cyclically for closed curves.

Reason for deleting 3 old sockets:

1. They are redundant in most situations.
2. Optimization of this kind of algorithm is strange, for example, a transport node in nearest mode could also output the normal or position just as an optimization. This is strange.
3. If this node is used only for the normal, then other old sockets can work the same way, but the new random type always evaluate the data to array. Because of this, even if not used, it will degrade the old node design.