Services refactor

Replace structs of Dep<Service> with OnceServices, so each service has a Services reference

Remove service name => Service map

Flatten Services.rooms

Make reqwest Clients lazy initialized (client service)

src/api/client/keys.rs

@@ -394,7 +394,6 @@ pub(crate) async fn get_key_changes_route(
 	);
 
 	let mut rooms_joined = services
-		.rooms
 		.state_cache
 		.rooms_joined(sender_user)
 		.boxed();