chore(templates): update cloudflare templates to support streaming and defer in entry.server.tsx

[dgurns]

The cloudflare-pages and cloudflare-workers templates had been updated to React 18, but do not currently support streaming responses and defer.

This PR:

• Updates those templates to do so. Now a new project initialized with either of those templates should support defer out of the box.
• Updates the docs for defer to include steps on how to upgrade an older Remix app to support defer, including necessary changes in entry.client.tsx and entry.server.ts that enable client-side React 18 hydration and streaming responses.
• Run cloudflare-pages/cloudflare-workers local dev servers on port 3000 to match the default remix server behavior

I pulled the entry.server.tsx code from @jacob-ebey's example project which deploys to Cloudflare and tested that the updated cloudflare-pages/cloudflare-workers templates run successfully for local dev, including with defer.

Thanks for all your great work and very excited to begin playing around with defer.

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[MichaelDeBoey]

Closing this as we're already going to have these changes once #4600 is merged

[dgurns]

Sounds good, only thought is it might still be worthwhile to have info in the defer README about how to upgrade an older Remix app to support it?

Even with the new implicit entry files, an older project would still have them explicitly defined and they likely wouldn't be set up for streaming yet.

Even better would be some kind of codemod that would automatically upgrade deps and entry files to support streaming/defer.