[EC-272] Web workers using EncryptionService (#3532)

* Add item decryption to encryptService
* Create multithreadEncryptService subclass to handle web workers
* Create encryption web worker
* Refactor cipherService to use new interface
* Update dependencies

libs/common/src/interfaces/decryptable.interface.ts

@@ -0,0 +1,12 @@
+import { SymmetricCryptoKey } from "../models/domain/symmetric-crypto-key";
+
+import { InitializerMetadata } from "./initializer-metadata.interface";
+
+/**
+ * An object that contains EncStrings and knows how to decrypt them. This is usually a domain object with the
+ * corresponding view object as the type argument.
+ * @example Cipher implements Decryptable<CipherView>
+ */
+export interface Decryptable<TDecrypted extends InitializerMetadata> extends InitializerMetadata {
+  decrypt: (key?: SymmetricCryptoKey) => Promise<TDecrypted>;
+}

libs/common/src/interfaces/initializer-metadata.interface.ts

@@ -0,0 +1,11 @@
+import { InitializerKey } from "../services/cryptography/initializer-key";
+
+/**
+ * This interface enables deserialization of arbitrary objects by recording their class name as an enum, which
+ * will survive serialization. The enum can then be matched to a constructor or factory method for deserialization.
+ * See get-class-initializer.ts for the initializer map.
+ */
+export interface InitializerMetadata {
+  initializerKey: InitializerKey;
+  toJSON?: () => { initializerKey: InitializerKey };
+}