Dual extraction

[Zeophlite]

Objective

• Allow extraction to work for multiple sub-apps (see bevy_extract tracking #24483 )

e.g.

// Extract a component from the main subapp to the render subapp, and the audio subapp

#[derive(Component, Clone, Debug, ExtractComponent)]
#[extract_app(RenderApp, AudioApp)]
struct SomeComponent;

Solution

• Follows Extract extract to bevy_extract #22852

Reviewer notes: changes for this PR are listed below. Other commits are pre-requisties in the preceeding PRs. Please review commit-by-commit:

• ca522dfcc9 - Dual extraction
• acd41a4711 - Support #[extract_app(AppA,AppB)] in derive(ExtractComponent)

Testing

• CI
• cargo run --example animated_mesh