### 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)

}
void RasterizerCanvasGLES3::canvas_begin(RID p_to_render_target, bool p_to_backbuffer) {
	GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
	GLES3::Config *config = GLES3::Config::get_singleton();
	GLES3::RenderTarget *render_target = texture_storage->get_render_target(p_to_render_target);
	if (p_to_backbuffer) {
		glBindFramebuffer(GL_FRAMEBUFFER, render_target->backbuffer_fbo);
		glActiveTexture(GL_TEXTURE0 + config->max_texture_image_units - 4);
		GLES3::Texture *tex = texture_storage->get_texture(texture_storage->texture_gl_get_default(GLES3::DEFAULT_GL_TEXTURE_WHITE));
		glBindTexture(GL_TEXTURE_2D, tex->tex_id);
	} else {
		glBindFramebuffer(GL_FRAMEBUFFER, render_target->fbo);
		glActiveTexture(GL_TEXTURE0 + config->max_texture_image_units - 4);
		glBindTexture(GL_TEXTURE_2D, render_target->backbuffer);
	}
	if (render_target->is_transparent || p_to_backbuffer) {
		state.transparent_render_target = true;
		glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);