Make the authStrategy parameter work with the static .withDefaults() method

[gr2m]

follow up to #18 and related to #11

What we want is the following

import { Octokit } from "@octokit-next/core";

type CallbackStrategyOptions = {
  callback: () => string | Promise<string>;
};

function createCallbackAuth(options: CallbackStrategyOptions) {
  return async function auth() {
    return options.callback();
  };
}

const OctokitWithCallbackAuth = Octokit.withDefaults({
  authStrategy: createCallbackAuth,
});

// compiler should complain: `{ auth }` should be required because `authStrategy` is set to `createCallbackAuth` by default
new OctokitWithCallbackAuth();

Here is how auth strategies work in Octokit via the authStrategy and auth options:
https://github.com/octokit/authentication-strategies.js#authenticationstrategystrategyoptions

[gr2m]

I got some of the necessary work done, but it's not fully working yet, I left a few TODO: comments in the code

octokit-next.js/tests/js/auth/index.test-d.ts

Lines 63 to 75 in af7fdec

	// Note: The code above gets the constructor options type from
	// `new <NowProvided>(...options: RequiredIfRemaining<PredefinedOptions, NowProvided>)`
	// while the code below gets the type from Octokit.constructor options
	// TODO: @ts-expect-error - options is required
	new OctokitWithCallbackAuth();
	// TODO: @ts-expect-error - options.auth is required
	new OctokitWithCallbackAuth({});
	// TODO: @ts-expect-error - options.auth must be set to `{ callback }`
	new OctokitWithCallbackAuth({
	auth: "",
	});

[github-actions]

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