make native javascript Promise Cancellable.

• Behavior like native Promise.
• Add Cancel state: Pending, Resolved, Rejected, +Canceled
• Can use instead of Promise Builted-in Object.
• Can call Cancel callback after chained promise.
• Can't change the promise state after promise is changed to Rejected, Fullfiled or Canceled.

    const myPromise = new CancellablePromise((resolve, reject) => {
        // write your code
    });

    myPromise.cancel = () => {}

    const cahined = myPromise
        .then(handleFulfilled, handleRejected)
        .catch(handleRejected)
        .finally(handleFinally);

    cahined.cancel();