createEndpoint accepts 2 arguments and uses GET as method.

[endel]

This PR is meant to make it easier and more intuitive to define GET methods, by making it optional to specify { method: "GET" } as second argument:

const endpoint = createEndpoint("/something", async (ctx) => {
  return { ... };
});

Previously, the user would need to specify the method as option in the second argument:

const endpoint = createEndpoint("/something", { method: "GET" }, async (ctx) => {
  return { ... };
});