Add previous/next item popups to tell users what's previous/next in queue

[1hitsong]

Changes

Continuation of work started in #1703

This PR adds popups that display when the user puts the previous or next buttons in focus on either the video OSD, or the Audio player view. These popups show an icon indicating the item type and the title of the item. If the item is a TV episode, we show the show title and season in addition to the episode name.

Breakdown of functionality: https://forum.jellyfin.org/t-what-s-next-and-previous-in-play-queue?pid=17588#pid17588

[jellyfin-bot]

This pull request has merge conflicts. Please resolve the conflicts so the PR can be reviewed. Thanks!

[jellyfin-bot]

This pull request has been inactive for 21 days and will be automatically closed in 7 days if there is no further activity.

[jellyfin-bot]

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