Support response headers for cases when it returns validation error

[maZahaca]

First of all, thank you very much for such a great tool!

We use an API Next.js + next-rest-framework which should have cors enabled.
For the cases when response is returned from inside the handler that is fine as we can add headers as following:

return TypedNextResponse.json({}, { status: 200, headers: cors.headers });

But when framework returns a validation error we can't find a way to add such headers to 400 Validation error response.

We're adding following headers:

      'access-control-allow-headers': 'Content-Type, Authorization, Origin, ..., Referrer',
      'access-control-allow-methods': 'GET, POST, PUT, DELETE, PATCH, OPTIONS',
      'access-control-allow-origin': `${requestedUrl?.protocol}//${requestedUrl?.host}`,

Would be nice to:

• capture all possible methods from this routes for proper value for access-control-allow-methods, extra added (OPTIONS covered by Next.js middleware now)
• have a method like middleware((res)), but which happens after validation process like for our case where we can set headers manually