### 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)

GLES3::MaterialStorage *material_storage = GLES3::MaterialStorage::get_singleton();
	canvas_begin(p_to_render_target, p_to_backbuffer);
	if (p_item_count <= 0) {
		
		return;
	}
	uint32_t index = 0;
	Item *current_clip = nullptr;
	
	
	bool batch_broken = false;
	_new_batch(batch_broken, index);
	
	state.canvas_instance_batches[state.current_batch_index].start = r_last_index;
	index = 0;
	for (int i = 0; i < p_item_count; i++) {
		Item *ci = items[i];
		if (ci->final_clip_owner != state.canvas_instance_batches[state.current_batch_index].clip) {
			_new_batch(batch_broken, index);
			state.canvas_instance_batches[state.current_batch_index].clip = ci->final_clip_owner;
			current_clip = ci->final_clip_owner;
		}
		RID material = ci->material_owner == nullptr ? ci->material : ci->material_owner->material;
		if (ci->canvas_group != nullptr) {
			if (ci->canvas_group->mode == RS::CANVAS_GROUP_MODE_CLIP_AND_DRAW) {
				if (!p_to_backbuffer) {
					material = default_clip_children_material;
				}