### Godot version

4.0 beta 10

### System information

Windows 10, Vulkan Renderer

### Issue description

In 2D scenes with sprites, when the sprite's `flip_h` and/or `flip_v` property is enabled, the normal map is flipped with the image, causing lighting to be reversed. While this does technically make sense, in a game where You have a bunch of sprites that flip and use normal maps, the only solution is to generate normal maps for both facing directions.
![image](https://user-images.githubusercontent.com/47702559/209426338-6257d66c-a965-4793-a7bb-5a635a136267.png)

Ultimately the fix is simple: Invert the red channel in normal maps on horizontally flipped sprites, and invert the green channel on vertically flipped sprites.

### Steps to reproduce

1) Create a Sprite2D
2) Add a Diffuse Texture and Normal Map 
3) Add a 2D Light to the scene
4) Enable `flip_h` and/or `flip_v` on the Sprite2D

### Minimal reproduction project

[Normal not flipped.zip](https://github.com/godotengine/godot/files/10298203/Normal.not.flipped.zip)

} else {
						src_rect = Rect2(0, 0, 1, 1);
					}
				}
				state.instance_data_array[r_index].modulation[0] = np->color.r * base_color.r;
				state.instance_data_array[r_index].modulation[1] = np->color.g * base_color.g;
				state.instance_data_array[r_index].modulation[2] = np->color.b * base_color.b;
				state.instance_data_array[r_index].modulation[3] = np->color.a * base_color.a;
				state.instance_data_array[r_index].src_rect[0] = src_rect.position.x;
				state.instance_data_array[r_index].src_rect[1] = src_rect.position.y;
				state.instance_data_array[r_index].src_rect[2] = src_rect.size.width;
				state.instance_data_array[r_index].src_rect[3] = src_rect.size.height;
				state.instance_data_array[r_index].dst_rect[0] = dst_rect.position.x;
				state.instance_data_array[r_index].dst_rect[1] = dst_rect.position.y;
				state.instance_data_array[r_index].dst_rect[2] = dst_rect.size.width;
				state.instance_data_array[r_index].dst_rect[3] = dst_rect.size.height;
				state.instance_data_array[r_index].flags |= int(np->axis_x) << FLAGS_NINEPATCH_H_MODE_SHIFT;
				state.instance_data_array[r_index].flags |= int(np->axis_y) << FLAGS_NINEPATCH_V_MODE_SHIFT;
				if (np->draw_center) {
					state.instance_data_array[r_index].flags |= FLAGS_NINEPACH_DRAW_CENTER;
				}
				state.instance_data_array[r_index].ninepatch_margins[0] = np->margin[SIDE_LEFT];
				state.instance_data_array[r_index].ninepatch_margins[1] = np->margin[SIDE_TOP];
				state.instance_data_array[r_index].ninepatch_margins[2] = np->margin[SIDE_RIGHT];
				state.instance_data_array[r_index].ninepatch_margins[3] = np->margin[SIDE_BOTTOM];
				_add_to_batch(r_index, r_batch_broken);
				
				state.instance_data_array[r_index].color_texture_pixel_size[0] = texpixel_size.x;
				state.instance_data_array[r_index].color_texture_pixel_size[1] = texpixel_size.y;
			} break;