Lite worker refactoring

[whitphx]

Description

Small refactorings on Lite. Not high priority. Plz review this when you have time.

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Storybook	ready!	Storybook preview
🦄	Changes	detected!	Details

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/ef95698f61ea6a4f62a65585c9a3a6c4c607e925/gradio-5.4.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@ef95698f61ea6a4f62a65585c9a3a6c4c607e925#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/ef95698f61ea6a4f62a65585c9a3a6c4c607e925/gradio-client-1.7.1.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/ef95698f61ea6a4f62a65585c9a3a6c4c607e925/dist/lite.js""></script>

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/lite	patch
@gradio/wasm	patch
gradio	patch

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Lite worker refactoring

Maintainers or the PR author can modify the PR title to modify this entry.

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• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[aliabd]

This LGTM @whitphx, thanks!

[aliabd]

not sure why lite unit test is failing

[whitphx]

Maybe the old commits were the problem? Merging the current main solved it.

Now different unit tests are failing. Will fix them.

[whitphx]

Found that the requestAnimationFrame trick is still needed because the timing of connectedCallback called may not be specified in the spec and we still need to care the case where the callback is called before parsing the child elements.