feat: add init_pymunk_poly to ground interface

src/ground.py

@@ -64,6 +64,10 @@ def calculate_y(self, x: int) -> int:
     @property
     def update(self):
         pass
+
+    @property
+    def init_pymunk_polygon(self, space):
+        pass
 
 
 class BasicSegment():
@@ -235,6 +239,9 @@ def move_segments(self, scroll_offset: float) -> None:
         for segment in self.terrain_segments:
             segment.body.position = (segment.body.position[0] - scroll_offset, segment.body.position[1])
 
+    def init_pymunk_polygon(self, space) -> None:
+        for segment in self.terrain_segments:
+            segment.init_pymunk_polygon(space)
 
 class PerlinSegment():
     def __init__(self, start_x: int, end_x: int) -> None:
@@ -253,7 +260,6 @@ def init_pymunk_polygon(self, space) -> None:
         poly = pymunk.Poly(body, self.points, radius=0.0)
         space.add(body, poly)
 
-
 class PerlinNoise():
 
     def __init__(