federation: Make all pub structs non_exhaustive

crates/ruma-federation-api/src/membership/create_invite/v1.rs

@@ -82,6 +82,7 @@ impl UnsignedEventContent {
 }
 
 /// Initial set of fields of `Request`.
+#[allow(clippy::exhaustive_structs)]
 pub struct RequestInit<'a> {
     /// The room ID that the user is being invited to.
     pub room_id: &'a RoomId,

crates/ruma-federation-api/src/membership/create_leave_event/v1.rs

@@ -114,4 +114,12 @@ impl Response {
 
 /// An empty object.
 #[derive(Clone, Debug, Default, Deserialize, Serialize)]
+#[allow(clippy::exhaustive_structs)]
 pub struct Empty {}
+
+impl Empty {
+    /// Create a new `Empty`.
+    pub fn new() -> Self {
+        Self {}
+    }
+}