chore: added TODO comments for priority future refactors

packages/pinball_components/lib/src/components/boundaries.dart

@@ -26,6 +26,7 @@ class _BottomBoundary extends BodyComponent with InitialPosition {
   /// {@macro bottom_boundary}
   _BottomBoundary()
       : super(
+          // TODO(ruimiguel): set final priority when RenderPriority PR merged.
           priority: Ball.boardPriority + 2,
           children: [_BottomBoundarySpriteComponent()],
         ) {

packages/pinball_components/lib/src/components/dino_walls.dart

@@ -31,6 +31,7 @@ class _DinoTopWall extends BodyComponent with InitialPosition {
   ///{@macro dino_top_wall}
   _DinoTopWall()
       : super(
+          // TODO(ruimiguel): set final priority when RenderPriority PR merged.
           priority: Ball.boardPriority + 1,
           children: [_DinoTopWallSpriteComponent()],
         ) {
@@ -126,6 +127,7 @@ class _DinoBottomWall extends BodyComponent with InitialPosition {
   ///{@macro dino_top_wall}
   _DinoBottomWall()
       : super(
+          // TODO(ruimiguel): set final priority when RenderPriority PR merged.
           priority: Ball.boardPriority + 1,
           children: [_DinoBottomWallSpriteComponent()],
         ) {