Add logout all endpoint.

src/r0/session.rs

@@ -2,3 +2,4 @@
 
 pub mod login;
 pub mod logout;
+pub mod logout_all;

src/r0/session/logout_all.rs

@@ -0,0 +1,18 @@
+//! [POST /_matrix/client/r0/logout/all](https://matrix.org/docs/spec/client_server/r0.4.0.html#post-matrix-client-r0-logout-all)
+
+use ruma_api_macros::ruma_api;
+
+ruma_api! {
+    metadata {
+        description: "Invalidates all access tokens for a user, so that they can no longer be used for authorization.",
+        method: POST,
+        name: "logout_all",
+        path: "/_matrix/client/r0/logout/all",
+        rate_limited: false,
+        requires_authentication: true,
+    }
+
+    request {}
+
+    response {}
+}