refactor: work on auth chain and state compressor

src/service/rooms/auth_chain/data.rs

@@ -0,0 +1,4 @@
+pub trait Data {
+    fn get_cached_eventid_authchain<'a>() -> Result<HashSet<u64>>;
+    fn cache_eventid_authchain<'a>(shorteventid: u64, auth_chain: &HashSet<u64>) -> Result<HashSet<u64>>;
+}