Examples/framework koa

[jpwilliams]

Summary

Add an "inngest/koa" serve handler.

Checklist

• [x] Added a docs PR that references this PR
• [x] Added unit/integration tests
• [x] Added changesets if applicable

Related

• Supersedes #252
• Supersedes #262
• inngest/website#574

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a7feb07c3d668a29dd77816d9541f16345085c31

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------- | ----- | | inngest | Minor |

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