Spectrogram tests

[hudson-newey]

• Adds spectrogram tests & fixtures
• Gets functionality working for the test/helper functions (these functions still have sub-optimal TS typing)
• Duck types the spectrogram component with the same events, properties, and attributes as the HTMLAudioElement (this allows oe-media-controls to access both elements through the same APIs and event bindings)
  • Changes the name of the playing property to paused
  • Changes the name of the playing event to play

I've done this to duck type the spectrogram component with HTMLAudioElement events, properties and attributes. This allows oe-media-controls to control spectrogram components and HTMLAudioElement's through the same API's and events

Added tests

• mount tests that assert the correct events are emitted when play() and pause() are called
• tests to check that a <source> element can be used as a media source in the spectrogram components default <slot>
• test to check that oe-media-controls can correctly mount/unmount and re-mount to spectrograms correctly
• Remove the oe-media-controls unit test example that is no longer needed (we originally created this as a proof of concept on how to test capturing events. Additionally, playing state is now handled by the oe-spectrogram component) this test is no longer needed as we have a practical example of testing captured events in the oe-spectrogram component

[github-actions]

🚀 Deployed on https://660f9fd0e4073958a5a7bfed--oe-web-components.netlify.app

[atruskie]

I have purposely not used conventional commits so that the package version isn't bumped and a release isn't created for these WIP components.

You should be even now. The whole history should be conventional, that's the point. We should disable the publish step instead.