### 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)

RenderingServer::CanvasItemTextureFilter texture_filter = p_item->texture_filter == RS::CANVAS_ITEM_TEXTURE_FILTER_DEFAULT ? state.default_filter : p_item->texture_filter;
	if (texture_filter != state.canvas_instance_batches[state.current_batch_index].filter) {
		_new_batch(r_batch_broken, r_index);
		state.canvas_instance_batches[state.current_batch_index].filter = texture_filter;
	}
	RenderingServer::CanvasItemTextureRepeat texture_repeat = p_item->texture_repeat == RS::CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT ? state.default_repeat : p_item->texture_repeat;
	if (texture_repeat != state.canvas_instance_batches[state.current_batch_index].repeat) {
		_new_batch(r_batch_broken, r_index);
		state.canvas_instance_batches[state.current_batch_index].repeat = texture_repeat;
	}
	Transform2D base_transform = p_canvas_transform_inverse * p_item->final_transform;
	Transform2D draw_transform; 
	Color base_color = p_item->final_modulate;
	uint32_t base_flags = 0;
	Size2 texpixel_size;
	bool reclip = false;
	bool skipping = false;
	
	uint32_t lights[4] = { 0, 0, 0, 0 };
	uint16_t light_count = 0;
	{
		Light *light = p_lights;
		while (light) {
			if (light->render_index_cache >= 0 && p_item->light_mask & light->item_mask && p_item->z_final >= light->z_min && p_item->z_final <= light->z_max && p_item->global_rect_cache.intersects_transformed(light->xform_cache, light->rect_cache)) {
				uint32_t light_index = light->render_index_cache;