fix(js-runtime,cli,serverless): error when handler doesn't return a Response

[QuiiBz]

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Not returning a response would previously error with an error inside the js-runtime code, which wasn't ideal. This makes sure users get a proper error message if they forgot to return a Response from the handler

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🦋 Changeset detected

Latest commit: 4aa38bb1e12442dd11cbfb380bb27c0a7cb73aa1

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

This PR includes changesets to release 4 packages

| Name | Type | | ----------------- | ----- | | @lagon/js-runtime | Patch | | @lagon/cli | Patch | | @lagon/serverless | Patch | | @lagon/runtime | Patch |

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