Feature: Mark post as read when opening from media previews

[rcbadiale]

Description

Updates the behavior from the media previews (image and multimedia) to set the post as read when opened by taping them.

Changes Made

• Modified the EmbeddedMultiMediaView to receive an onTap callback and call it when tapped;
• Modified the MediaView to receive an onTap callback and:
  • call it when the type is image;
  • pass it along to the EmbeddedMultiMediaView
• Modified the PostFeedView to pass the PostUtils.shared.markRead to the previews to be called on tap;

Expected behavior

Given the user is on the feed view (home, all, favorites, subreddit, ...)
And there are posts with previews (image, video, url)
When the user tap the preview
Then the preview should load the image/video/url
When going back to the feed
Then the post should be marked as read