feature: Support Fan Out function setup

[dthyresson]

Fixes https://github.com/inngest/envelop-plugin-inngest/issues/75

PR

• adds fan-out type example to simulate sending many user emails.
• adds tests for rendering function templates

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 79f867cc53fc94ff6967eedbd8697e5e1e820d25

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

This PR includes changesets to release 1 package

| Name | Type | | ----------------------- | ----- | | inngest-setup-redwoodjs | Minor |

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