fix: video element memory leak + optimizations

[luwes]

fixes #750

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[codecov[bot]]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (ebb4f15) 78.07% compared to head (92f8d54) 78.67%.

Files	Patch %	Lines
src/js/media-container.js	89.09%	6 Missing :warning:
src/js/media-controller.js	97.72%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #775 +/- ## ========================================== + Coverage 78.07% 78.67% +0.60% ========================================== Files 58 58 Lines 10599 10627 +28 ========================================== + Hits 8275 8361 +86 + Misses 2324 2266 -58 ```

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[luwes]

ha! I put the track elements back in and the memory leak is back... digging

            <track
              label="thumbnails"
              default
              kind="metadata"
              src="https://image.mux.com/DS00Spx1CV902MCtPj5WknGlR102V5HFkDe/storyboard.vtt"
            />
            <track
              label="English"
              kind="captions"
              srcLang="en"
              src="./vtt/en-cc.vtt"
            />

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Name	Status	Preview	Comments	Updated (UTC)
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