refactor: use async-aware RwLocks and Mutexes where possible

src/lib.rs

@@ -4,6 +4,9 @@ mod database;
 mod service;
 mod utils;
 
+// Not async due to services() being used in many closures, and async colsures are not stable as of writing
+// This is the case for every other occurence of sync Mutex/RwLock, except for database related ones, where
+// the current maintainer (Timo) as asked to not modify those
 use std::sync::RwLock;
 
 pub use api::ruma_wrapper::{Ruma, RumaResponse};