Add timeouts to JS Client

[hannahblair]

Description

Closes: #(issue)

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
:unicorn:	Changes	detected!	Details

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/13bf9b47bd5a76db23e48a2ba93bf46267003c98/gradio-4.32.2-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@13bf9b47bd5a76db23e48a2ba93bf46267003c98#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-builds.s3.amazonaws.com/13bf9b47bd5a76db23e48a2ba93bf46267003c98/gradio-client-0.20.1.tgz

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/client	minor
gradio	minor

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

With the following changelog entry.

Add timeouts to JS Client

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](https://github.com/gradio-app/gradio/edit/client-timeouts/.changeset/smart-schools-spend.md).

[pngwn]

I thought we already did this here: https://github.com/gradio-app/gradio/blob/main/client/js/src/helpers/spaces.ts#L52-L54

This function should be polling the space if it isn't active and waiting until it is, then returning.