Fix #140040: Curve to Points length input should be a field

This commit changes the length input of the Curve to Points node to be
a field input, allowing users to more easily set a seperate length per
curve.

Pull Request: https://projects.blender.org/blender/blender/pulls/140048

source/blender/nodes/geometry/nodes/node_geo_curve_to_points.cc

@@ -41,6 +41,7 @@ static void node_declare(NodeDeclarationBuilder &b)
                      .default_value(0.1f)
                      .min(0.001f)
                      .subtype(PROP_DISTANCE)
+                     .field_on_all()
                      .make_available([](bNode &node) {
                        node_storage(node).mode = GEO_NODE_CURVE_RESAMPLE_LENGTH;
                      });