[App Router] Update the next.js handlers (revalidateHandlers and previewHandler) to support Route Handlers. #791
Description
Is your enhancement related to a problem? Please describe.
Update the next.js handlers (revalidateHandlers and previewHandler) to support Route Handlers.
Refactor previewHandler to use the new draft api.
Designs
No response
Describe alternatives you've considered
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Code of Conduct
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