feat: make viser a required dependency and support viser playback on all playback-capable backends - #1638

Failed to save: Unable to reserve cache with key setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.12.3-pruned-f18b1079d6b0d459d82fa0b84bd409749e8fb7c442446cda6ce0805ec0020cc5, another job may be creating this cache.