feat(ffi): expose the linked chunk debug string function at the FFI layer

bindings/matrix-sdk-ffi/src/room.rs

@@ -933,6 +933,13 @@ impl Room {
 
         Ok(handle)
     }
+
+    /// Return a debug representation for the internal room events data
+    /// structure, one line per entry in the resulting vector.
+    pub async fn room_events_debug_string(&self) -> Result<Vec<String>, ClientError> {
+        let (cache, _drop_guards) = self.inner.event_cache().await?;
+        Ok(cache.debug_string().await)
+    }
 }
 
 impl From<matrix_sdk::room::knock_requests::KnockRequest> for KnockRequest {