Binding to Promise.allSettled

[cometkim]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/allSettled

type PromiseSettlementResult<V, R> = (
  | PromiseFulfilledResult<V>
  | PromiseRejectedResult<R>
);

type PromiseFulfilledResult<V> = {
  status: 'fulfilled',
  value: V,
};

type PromiseRejectedResult<R> = {
  status: 'rejected',
  reason: R,
}

The return type of that API is a tagged object. In order to add bindings without runtime, the previous issue need to be resolved first.