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/server/state.rs

@@ -25,14 +25,12 @@ pub(crate) async fn get_room_state_route(
 	.await?;
 
 	let shortstatehash = services
-		.rooms
 		.state_accessor
 		.pdu_shortstatehash(&body.event_id)
 		.await
 		.map_err(|_| err!(Request(NotFound("PDU state not found."))))?;
 
 	let state_ids: Vec<OwnedEventId> = services
-		.rooms
 		.state_accessor
 		.state_full_ids(shortstatehash)
 		.map(at!(1))
@@ -42,7 +40,7 @@ pub(crate) async fn get_room_state_route(
 	let pdus = state_ids
 		.iter()
 		.try_stream()
-		.and_then(|id| services.rooms.timeline.get_pdu_json(id))
+		.and_then(|id| services.timeline.get_pdu_json(id))
 		.and_then(|pdu| {
 			services
 				.sending
@@ -53,10 +51,9 @@ pub(crate) async fn get_room_state_route(
 		.await?;
 
 	let auth_chain = services
-		.rooms
 		.auth_chain
 		.event_ids_iter(&body.room_id, once(body.event_id.borrow()))
-		.and_then(async |id| services.rooms.timeline.get_pdu_json(&id).await)
+		.and_then(async |id| services.timeline.get_pdu_json(&id).await)
 		.and_then(|pdu| {
 			services
 				.sending