Show voice message preview player progress (#1675)

* Show voice message preview player progress

* Update screenshots

* Fix test

* Some nits over mediaplayer stuff

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Co-authored-by: ElementBot <benoitm+elementbot@element.io>
Co-authored-by: Marco Romano <marcor@element.io>

libraries/mediaplayer/api/src/main/kotlin/io/element/android/libraries/mediaplayer/api/MediaPlayer.kt

@@ -74,5 +74,9 @@ interface MediaPlayer : AutoCloseable {
          * The current position of the player.
          */
         val currentPosition: Long,
+        /**
+         * The duration of the current content.
+         */
+        val duration: Long,
     )
 }