Publish declaration files in `@inngest/middleware-encryption`

[jpwilliams]

Summary

Add TS declaration files for @inngest/middleware-encryption.

Checklist

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d18640890ec1f1dafb8cebe1cd0ad738dcb93229

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

This PR includes changesets to release 1 package

| Name | Type | | ------------------------------ | ----- | | @inngest/middleware-encryption | Patch |

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