Add Google Functions Framework example

[djfarrelly]

Summary

This adds an example from our docs with working code that also supports TypeScript which the Functions Framework's README doesn't include.

Checklist

• [x] Added a docs PR that references this PR (already in docs!)
• [ ] Added unit/integration tests
• [ ] Added changesets if applicable

Related

https://github.com/inngest/website/pull/563

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: f387c7a91c7309d0a5997e4bf7bd03bc9d573e05

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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