Enhancement: Support the advanced features in SpotifyPlus

[kbrown01]

There are many new features that have been included in the new SpotifyPlus integration:

https://github.com/thlucas1/homeassistantcomponent_spotifyplus/wiki

A lot of these would be great to have to turn the Spotify card into something that is almost 100% as good as the Spotify App or Web Player. These include such things as searching which I would find extremely valuable as I am always using HA on a tablet and also my phone or the tablet with the Spotify App when entertaining so friends can search and queue music.

The lists of services is here:

https://github.com/thlucas1/homeassistantcomponent_spotifyplus/wiki/Services-Provided

I am not the developer of this integration, just installed it a day or so ago and started playing around just with Developer's tools and calling the various services.