split server_keys from event_handler into service

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/mod.rs

@@ -18,6 +18,7 @@ pub mod pusher;
 pub mod resolver;
 pub mod rooms;
 pub mod sending;
+pub mod server_keys;
 pub mod transaction_ids;
 pub mod uiaa;
 pub mod updates;