Support Video Acceleration API (VA-API)

_Originally created by @intrigeri on _#14580 (Redmine)

va-driver-all pulls in all libraries/drivers needed for Video Acceleration API (VA-API), that provide accelerated video playback and video post-processing for a great number of supported graphics cards. gstreamer1.0-vaapi links them with GStreamer and thus Totem. Installing these packages would improve video playback performance on very common hardware, hence improving UX UX and possibly lowering the amount of (recurring) requests for another video player than Totem. Installing them on Tails 3.1 downloads 2 MiB of packages.

Next step is to verify that VA-API is used (in practice) in Totem with this change applied.