Add Astro framework example

[djfarrelly]

Summary

Add a minimal Astro project example with Inngest.

NOTE - Requires #441 to be merged and released.

Checklist

• [ ] Added a docs PR that references this PR N/A Will add in #441
• [x] Added unit/integration tests
• [x] Added changesets if applicable

Related

• INN-2488

• 441

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 042dda6f0fe3390891f6412c97cc4b4ffa74ead2

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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