feat: WIP relationships and threads

src/api/client_server/relations.rs

@@ -0,0 +1,10 @@
+use crate::{services, Result, Ruma};
+use std::time::{Duration, SystemTime};
+
+/// # `GET /_matrix/client/r0/todo`
+pub async fn get_relating_events_route(
+    body: Ruma<get_turn_server_info::v3::Request>,
+) -> Result<get_turn_server_info::v3::Response> {
+    let sender_user = body.sender_user.as_ref().expect("user is authenticated");
+    todo!();
+}