fix: add client response type inference when options.throw is true

[ledouxm]

Hello !
I had an issue with the return type of the better-fetch client when using { throw: true } :

const api = createClient<AppRouter>({
  throw: true,
});


const api2 = createClient<AppRouter>({
  throw: false,
});

const resp1 = await api("/is-first-connection", {});
const resp2 = await api2("/is-first-connection", {});

type AreResponsesEqual = typeof resp1 extends typeof resp2 ? true : false;
//   ^? type AreResponsesEqual = true

So I've used function overloading to fix it.

If you think of a better way of achieving this, please let me know :)