Rework createResource

[Olian04]

Rework will include 3 major changes:

1. ResourceStatus

const R1 = createResource({
  get: () => fetch(...),
});

R1.get(); // { status: ResourceStatus.PENDING }
await R1.get(); // { status: ResourceStatus.SUCCESS, value: Response }


const R2 = createResource({
  get: () => fetch(...),
});

R2.get(); // { status: ResourceStatus.PENDING }
await R2.get(); // { status: ResourceStatus.FAILED, error: Error }

2. Requests re-use and requests abortion (previously Add requests re-use and requests abortion to resources #21)

const URL = createAtom({
  default: '/',
});

const A = createResource({
  get: signal => fetch(URL.get(), { signal }), 
});

A.get(); // promise 1
await A.get(); // promise 1

URL.set('/foo');
A.get(); // promise 2
URL.set('/bar');
A.get(); // promise 3 & aborted promise 2

3. Response memoization (previously Add memoization to resources #3)

const A = createAtom({
  default: 42,
})

const C = createResource({
  get: () => fetch(`/${A.get()}`)
);

await C.get(); // network request
await C.get(); // cached

A.set(3);
await C.get(); // network request
await C.get(); // cached

A.set(42);
await C.get(); // cached

A.invalidate();
await C.get(); // network request
await C.get(); // cached

[Olian04]

WIP: ResourceStatus
PromiseLike Resource