feat(playback-core): custom cap level controller

[cjpillsbury]

Implements a custom CapLevelController that ensures we never cap to 480p (portrait or landscape)

To test:

1. Go to: https://elements-demo-nextjs-git-fork-cjpillsbury-feat-custo-7d5867-mux.vercel.app/MuxPlayer
2. In the config UI, use the width input to set MuxPlayer's width to something smaller than 480p (keep in mind dpp, so you may want to choose something small like 200
3. In the config UI, use the playbackId input to set the desired playbackId (or choose one from the dropdown)
4. Confirm that quality doesn't look sad

• NOTE: For advanced/programmatic confirmation, you can e.g. open the browser's dev tools beforehand, go to the network tab, filter by .m3u8, and make sure the video media playlists being requested match a resolution > 480p from the response content of the multivariant playlist

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