Add `framework-nestjs` example

[jpwilliams]

Summary

Adds an example for NestJS based on inngest/sdk-example-nestjs.

cc @anafilipadealmeida

Checklist

• [ ] Added a docs PR that references this PR N/A
• [ ] Added unit/integration tests N/A
• [x] Added changesets if applicable
• [ ] Adjust README to show information about Inngest

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 2bf1347f3bc35b4d2437a035c77c14223112b7cf

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[jpwilliams]

Superseded by #387.