Refactor join, alias services

Split knock, user register from api into services

Fix autojoin not working with v12 rooms

Fix 'm.login.registration_token/validity' for reloaded registration tokens

Change join servers order

Move autojoin for ldap

src/service/users/dehydrated_device.rs

@@ -51,10 +51,10 @@ pub async fn set_dehydrated_device(&self, user_id: &UserId, request: Request) ->
 
 	self.create_device(
 		user_id,
-		&request.device_id,
+		Some(&request.device_id),
 		(None, None),
 		None,
-		request.initial_device_display_name.clone(),
+		request.initial_device_display_name.as_deref(),
 		None,
 	)
 	.await?;