feat: add IRapidPlanner, RapidPath, and SafeHeightRapidPlanner

OpenNest.Engine/RapidPlanning/RapidPath.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+using OpenNest.Geometry;
+
+namespace OpenNest.Engine.RapidPlanning
+{
+    public readonly struct RapidPath
+    {
+        public bool HeadUp { get; init; }
+        public List<Vector> Waypoints { get; init; }
+    }
+}