Proposal: Add example build setups & use cases for reference and smoke testing.

[cjpillsbury]

Recently, an issue came up that only occurs when loading @mux/videojs-kit in a node environment. It would be good to have some ready to use examples to do basic smoke testing for build setups and app use cases, whether they get added to this project or some other well-known one. A couple of potential references:

• example apps similar to https://github.com/muxinc/elements/tree/main/examples (with whatever set would be appropriate)
• example build setups a la https://github.com/videojs/videojs-bundler-sample (thanks @gkatsev for putting this on my radar)

[gkatsev]

Video.js also has require tests that run node, webpack, and browserify builds as part of tests to verify that there aren't any regressions https://github.com/videojs/video.js/tree/main/test/require