fix(player): add mouse event handlers ('mouseenter' and 'mouseleave)

Handles the 'mouseenter' and 'mouseleave' events when triggered in the control-bar
Closes videojs#5258

src/js/player.js

@@ -3444,6 +3444,16 @@ class Player extends Component {
     this.on('mousemove', handleMouseMove);
     this.on('mouseup', handleMouseUp);
 
+    this.on(this.getChild('controlBar'), 'mouseenter', function(event) {
+      this.options_.inactivityTimeout = 0;
+
+    });
+
+    this.on(this.getChild('controlBar'), 'mouseleave', function(event) {
+      this.options_.inactivityTimeout = 2000;
+
+    });
+
     // Listen for keyboard navigation
     // Shouldn't need to use inProgress interval because of key repeat
     this.on('keydown', handleActivity);