Extract types for re-use in matrix-js-sdk.d.ts (#12350)

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/call-types.ts

@@ -17,3 +17,12 @@ limitations under the License.
 // Event type for room account data and room creation content used to mark rooms as virtual rooms
 // (and store the ID of their native room)
 export const VIRTUAL_ROOM_EVENT_TYPE = "im.vector.is_virtual_room";
+
+export const JitsiCallMemberEventType = "io.element.video.member";
+
+export interface JitsiCallMemberContent {
+    // Connected device IDs
+    devices: string[];
+    // Time at which this state event should be considered stale
+    expires_ts: number;
+}