Provide unserialized body to onRequest middleware

[swantzter]

it's relatively expensive to have to clone the request to extract the body again in middleware, and as bodySerializer is provided as part of the options given to the requestSerializer it makes sense to also provide the original body here for advanced use cases that aren't covered by the bodySerializer.

In my case I'm dealing with an API that wants files uploaded to a secondary endpoint after the main request has completed, but I want to provide a good developer experience where they can provide a body such as { description: string, document: File }, to do this I need to traverse the body in a request middleware, extract the files (removing them from the serialized JSON body), link these files to the id (or new Request in a WeakMap), and then if they exist in the onResponse middleware actually post them.

Changes

• adds body as one of the properties of the options passed to onRequest middleware

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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