Update media player attributes to support current playlist uri

[andrew-kennedy]

I'm not sure if this is allowed or complies with home assistant's default media player attributes, but it would be super useful to be able to get the current playlist Uri to be able to seamlessly transfer playback to other speakers.

[thlucas1]

@andrew-kennedy I like the idea of having the playlist uri available.

I would also suggest the following:

• use a name that is similar to the HA naming standards (e.g. media_playlist_content_id). It will still be the Spotify uri value.
• also implement the media_playlist_content_id as a state variable, which will allow you to trigger events in HA when the value changes. It will also show up in the Developer Tools States display.
• also add properties for the media_playlist_description, media_playlist_content_type, and media_playlist_image_url values; note that these do not need to be state variables.

If that works for you, I am making some other changes for the integration and can get them added within a couple of days.

Thoughts?

Example:

[thlucas1]

FYI - just released a new version of the SpotifyPlus integration

[ 1.0.27 ] - 2024/06/12

Added extra state attribute media_playlist_content_id that contains the Content ID of current playing playlist context if one is active; otherwise, None. Added property media_player.media_playlist_content_id that contains the Content ID of current playing playlist context if one is active; otherwise, None. Added property media_player.media_playlist_content_type that contains the Content Type of current playing playlist if one is playing; otherwise, None. Added property media_player.media_playlist_description that contains the Description of current playing playlist if one is playing; otherwise, None. Added property media_player.media_playlist_image_url that contains the Image URL of current playing playlist if one is playing; otherwise, None. Updated use_ssl description on all of the Zeroconf Device services.

Will close this PR as the above contains your requested changes.