Type routes correctly based on their method

[dsluijk]

Describe the feature

Currently if you have multiple routes with the same name but a different method, the return type is set to a combination of the two. This requires you to change the types after a request has been send, which is not a great developer experience. As the method is given when sending the request, it is possible to return the correct types based on the method.

This is also required for nuxt/nuxt#15280.

Additional information

• Would you be willing to help implement this feature?