feat: add ability to choose a Media Theme via attribute

[luwes]

this change adds the ability to use a different theme via a simple theme="media-theme-goldshine" attribute ✨

it required some changes to the html tagged template renderer.
added support for unsafe static values that can make part of the HTML string to be process by the template parser.

[vercel]

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Name	Status	Preview	Updated
elements-demo-create-react-app	✅ Ready (Inspect)	Visit Preview	Jul 12, 2022 at 9:38PM (UTC)
elements-demo-nextjs	✅ Ready (Inspect)	Visit Preview	Jul 12, 2022 at 9:38PM (UTC)
elements-demo-svelte-kit	✅ Ready (Inspect)	Visit Preview	Jul 12, 2022 at 9:38PM (UTC)
elements-demo-vanilla	✅ Ready (Inspect)	Visit Preview	Jul 12, 2022 at 9:38PM (UTC)
elements-demo-vue	✅ Ready (Inspect)	Visit Preview	Jul 12, 2022 at 9:38PM (UTC)

[codecov]

Codecov Report

Merging #269 (154295c) into main (b1efffb) will increase coverage by 0.13%.
The diff coverage is 88.11%.

@@            Coverage Diff             @@
##             main     #269      +/-   ##
==========================================
+ Coverage   80.39%   80.53%   +0.13%     
==========================================
  Files          36       36              
  Lines        4356     4371      +15     
  Branches      151      149       -2     
==========================================
+ Hits         3502     3520      +18     
+ Misses        845      842       -3     
  Partials        9        9              

Impacted Files	Coverage Δ
packages/mux-player/src/index.ts	73.06% <50.00%> (-0.37%)	⬇️
packages/mux-player/src/helpers.ts	93.85% <71.42%> (-1.57%)	⬇️
packages/mux-player/src/template.ts	93.66% <86.76%> (+0.80%)	⬆️
.../mux-player/src/media-theme-mux/media-theme-mux.ts	78.29% <94.91%> (+0.15%)	⬆️
packages/mux-player/src/html.ts	97.20% <96.00%> (-0.37%)	⬇️
packages/mux-player/src/media-theme-mux/styles.css	100.00% <100.00%> (ø)

[cjpillsbury]

😎

[cjpillsbury]

👍 lgtm