feat: add throwable usage

[2-towns]

This PR allows to use throwable object instead of safe value. Example:

import { Codex } from "@codex-storage/sdk-js/throwable";

const marketplace = codex.marketplace;

try {
  const slots = marketplace.activeSlots();
} catch (e) {
  // Do something
}

@AuHau

[AuHau]

Nice! Thanks a lot! 👍

[AuHau]

Suggested change

	const slots = marketplace.activeSlots();
	const slots = await marketplace.activeSlots();

Shouldn't it be like this?