Media player scrub through functionality support

Steps to Reproduce

  1. Import an Img File Source
  2. Create a media player with a media texture
  3. Create a material using the media texture to render the media player output
  4. Assign the material to an image widget component.
  5. In the player pawn blueprint, use the enhanced input system to handle touch input and call the play/seek/pause sequence on the widget component, mapping the touch input value to the desired duration of the video.