[Feature]: Generics for APIRequestContext and APIResponse

🚀 Feature Request

It would be great to be able to directly type the response type of the provided APIResponse.json() instead of having an any type.

Already discussed in:
https://github.com/microsoft/playwright/issues/13795

Example

interface User {
  id: string;
  name: string;
}

const response = await request.get<User>('/api/users/42');

// Directly typed as User 🥳
const user = await response.json()

Motivation

It would allow better type safety for requests made with Playwright, instead of using type cast.