Add support for media player volume to tile card

I love the new tile card in 2022.11, and the “feature” feature (uh) in 2022.12 is also really cool.

Any chance of getting support for using the slider feature to control the volume on a media player entity?

Or, maybe even better yet, making slider features configurable so I can add a slider to any Tile and tell it what service to call with the current value of the slider?