SPIGOT-6436: Add Player#stopAllSounds

By: Doc <nachito94@msn.com>

paper-api/src/main/java/org/bukkit/entity/Player.java

@@ -377,6 +377,11 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
      */
     public void stopSound(@NotNull String sound, @Nullable SoundCategory category);
 
+    /**
+     * Stop all sounds from playing.
+     */
+    public void stopAllSounds();
+
     /**
      * Plays an effect to just this player.
      *