Add new Workflows example

[thomas-desmond]

Summary

This PR includes a new example for Workflows. Referencing this example: https://github.com/cloudflare/docs-examples/tree/main/workflows/waitForEvent added to the doc-examples repository.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Added a new example for Cloudflare Workflows demonstrating a human-in-the-loop image tagging process using the waitForEvent API.

• Introduced a new example for Workflows that processes user-uploaded images with human approval.
• Demonstrated the use of the waitForEvent API in a Cloudflare Workflow.
• Included a Next.js frontend application for image upload and approval.
• Provided detailed instructions and links to the complete codebase and deployment details.

Added Files

• src/content/docs/workflows/examples/wait-for-event.mdx

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[Oxyjun]

Suggested change

	You can deploy this example straight away using the "Deploy to Cloudflare" button.
	[](https://deploy.workers.cloudflare.com/?url=https://github.com/cloudflare/docs-examples/tree/main/workflows/waitForEvent)
	Continue with the rest of the page to fully understand the example.

We could use the new button to expedite deployment, if the user wants that. I've not yet tested this code though.

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