Add internal events to default `EventSchemas`

[jpwilliams]

Summary

Adds internal inngest/function.failed and inngest/function.completed events to the list of default events when using new EventSchemas().

Checklist

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 9b80abf57e287e5b7041a6593175d843c4daca45

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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