Fix missing `EventPayload.id`

[jpwilliams]

Summary

Fixes #423, where id is missing in types when attempting to send an event using inngest.send() or step.sendEvent().

Checklist

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

Related

• Fixes #423
• Docs also being changed at inngest/website#605 to adjust the comment to be the same as here

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 15e647eb73ffd794652ebf9a32da7d7a176ea83b

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

This PR includes changesets to release 1 package

| Name | Type | | ------- | ----- | | inngest | Patch |

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