Code autocompletion

[whitphx]

Description

Context: internal link
Before implementing a customized autocompletion source, this PR just introduces the autocomplete option on gr.Code.

WIP (draft): The darkmode style is not properly applied to the auto-completion UI, so this is still draft but let me assign some reviewers at this point to check if the overall direction is ok.

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website 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/ad59048128361d7dfa47cca62e893f7c2f4bc0ce/gradio-5.20.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@ad59048128361d7dfa47cca62e893f7c2f4bc0ce#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/ad59048128361d7dfa47cca62e893f7c2f4bc0ce/gradio-client-1.13.1.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/ad59048128361d7dfa47cca62e893f7c2f4bc0ce/dist/lite.js""></script>

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/code	minor
gradio	minor

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

With the following changelog entry.

Code autocompletion

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

Something isn't right?

• Maintainers can change the version label to modify the version bump.
• 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.