feat: add ended getter middleware (#7287)

One thing to note is that this won't affect the play toggle from changing to the replay button on ended because it only listens to the ended event. Otherwise, this works fine.

Author: alex-barstow

src/js/tech/middleware.js

@@ -188,7 +188,8 @@ export const allowedGetters = {
   played: 1,
   paused: 1,
   seekable: 1,
-  volume: 1
+  volume: 1,
+  ended: 1
 };
 
 /**