Component Hook functions as attributes for Component derive macro

[ItsDoot]

What problem does this solve or what need does it fill?

To specify hooks for a type requires manually implementing Component currently. It would be nice to be able to specify hooks as derive attributes.

What solution would you like?

#[derive(Component)]
#[component(on_add = my_on_add_function, on_remove = my_on_remove_function)]
struct MyComponent {
    // ...
}

fn my_on_add_function(world: DeferredWorld, entity: Entity, component: ComponentId) {
    // ...
}


fn my_on_remove_function(world: DeferredWorld, entity: Entity, component: ComponentId) {
    // ...
}

What alternative(s) have you considered?

Currently requires manual trait implementation.