Add styles for vertical VolumeSlider

[protyposis]

The VolumeSlider is currently only designed for the default horizonal use. When setting the config property vertical: true, it is incorrectly rendered because the styles for vertical rendering have not been written yet (they have been written partially but were never finished because nobody needed it yet).

Also applies to new VolumeControlButton({ vertical: false }).

[aguilarcarlos]

@protyposis I needed it for a project, I'll create a PR when I have the vertical styles in place.

[lucassouzamiranda]

@protyposis I needed it for a project.

[jonathanmachado]

@protyposis I needed it for a project. thanks

[ohtanya]

@aguilarcarlos did you ever get those vertical styles? 🙏