Add type hints to scene_file_writer.py, section.py, and zoomed_scene.py (#4133)

* Add type hints to scene/scene_file_write.py

* Add type hints to scene/scene_file_write.py

* Add type hints to scene/section.py

* Add type hints to scene/zoomed_scene.py

* Add type hints to scene/moving_camera_scene.py

* Fix typing of variable scene_name

* Fix typing

* Fix one more type hint

Author: fmuenkel

manim/camera/moving_camera.py

@@ -36,7 +36,7 @@ def __init__(
         default_frame_stroke_color=WHITE,
         default_frame_stroke_width=0,
         **kwargs,
-    ):
+    ) -> None:
         """Frame is a Mobject, (should almost certainly be a rectangle)
         determining which region of space the camera displays
         """

manim/scene/moving_camera_scene.py

@@ -89,11 +89,12 @@ def create_scene(number):
 
 __all__ = ["MovingCameraScene"]
 
-from typing_extensions import Any
+from typing import Any
 
 from manim.animation.animation import Animation
 from manim.mobject.mobject import Mobject
 
+from ..camera.camera import Camera
 from ..camera.moving_camera import MovingCamera
 from ..scene.scene import Scene
 from ..utils.family import extract_mobject_family_members
@@ -115,7 +116,7 @@ class MovingCameraScene(Scene):
     """
 
     def __init__(
-        self, camera_class: type[MovingCamera] = MovingCamera, **kwargs: Any
+        self, camera_class: type[Camera] = MovingCamera, **kwargs: Any
     ) -> None:
         super().__init__(camera_class=camera_class, **kwargs)
 
@@ -131,7 +132,7 @@ def get_moving_mobjects(self, *animations: Animation) -> list[Mobject]:
         """
         moving_mobjects = super().get_moving_mobjects(*animations)
         all_moving_mobjects = extract_mobject_family_members(moving_mobjects)
-        movement_indicators = self.renderer.camera.get_mobjects_indicating_movement()
+        movement_indicators = self.renderer.camera.get_mobjects_indicating_movement()  # type: ignore[union-attr]
         for movement_indicator in movement_indicators:
             if movement_indicator in all_moving_mobjects:
                 # When one of these is moving, the camera should