feat: get web worker mechanism working (pass file around)

src/decrypt-worker/worker.ts

@@ -1,3 +1,12 @@
-onmessage = (e) => {
-  console.log(e.data);
-};
+import { WorkerServerBus } from '../util/WorkerEventBus';
+import { DECRYPTION_WORKER_ACTION_NAME } from './constants';
+
+const bus = new WorkerServerBus();
+onmessage = bus.onmessage;
+
+bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.DECRYPT, async (blobURI) => {
+  const blob = await fetch(blobURI).then((r) => r.arrayBuffer());
+  // TODO: Implement decryptor for blob received here.
+  console.log(blob);
+  return { hello: true };
+});