refactor: Moved renderer package into Flutter package

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_flutter/pubspec.yaml

@@ -25,6 +25,8 @@ dev_dependencies:
 
 # The following section is specific to Flutter packages.
 flutter:
+  shaders:
+    - shaders/wolf_world.frag
 
   # To add assets to your package, add an assets section, like this:
   # assets: