Fix a TS error when using Inngest in projects with `composite` setting

[MonsterDeveloper]

Summary

This PR Adds some type exports to index.ts that fix a TS error in composite projects.

After changes to the types.ts the issue #384 appeared again. This PR is similar to #385 - it fixes the TS error by adding necessary exports to the index.ts

Checklist

• [ ] Added a docs PR that references this PR N/A no docs needed
• [ ] Added unit/integration tests N/A not testable
• [x] Added changesets if applicable

Related

• 385

• 384

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 414e6379a9f2660813054a588ac7d08d03f1213a

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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[jpwilliams]

Thanks, @MonsterDeveloper. Let's get a CI check added for this, eh?