Support for async serialize/deserialize of transferHandler

[taro-28]

Motivation

Enabled to use async functions for serialize and deserialize of transferHandlers to transfer such as Blob.

Example

import * as Comlink from "comlink";

Comlink.transferHandlers.set("blob", {
  canHandle: (obj): obj is Blob => obj instanceof Blob,
  // Enable to use async functions.
  serialize: async (blob: Blob) => [
    { data: await blob.arrayBuffer(), type: blob.type, size: blob.size },
    [],
  ],
  deserialize: async (obj: BlobObject): Promise<Blob> =>
    new Blob([obj.data], { type: obj.type }),
});

Related

GoogleChromeLabs#646

[syumai]

LGTM