[PM-8280] email forwarders (#11563)

* forwarder lookup and generation support
* localize algorithm names and descriptions in the credential generator service
* add encryption support to UserStateSubject
* move generic rx utilities to common
* move icon button labels to generator configurations

libs/common/src/tools/private-classifier.ts

@@ -0,0 +1,31 @@
+import { Jsonify } from "type-fest";
+
+import { Classifier } from "@bitwarden/common/tools/state/classifier";
+
+export class PrivateClassifier<Data> implements Classifier<Data, Record<string, never>, Data> {
+  constructor(private keys: (keyof Jsonify<Data>)[] = undefined) {}
+
+  classify(value: Data): { disclosed: Jsonify<Record<string, never>>; secret: Jsonify<Data> } {
+    const pickMe = JSON.parse(JSON.stringify(value));
+    const keys: (keyof Jsonify<Data>)[] = this.keys ?? (Object.keys(pickMe) as any);
+
+    const picked: Partial<Jsonify<Data>> = {};
+    for (const key of keys) {
+      picked[key] = pickMe[key];
+    }
+    const secret = picked as Jsonify<Data>;
+
+    return { disclosed: null, secret };
+  }
+
+  declassify(_disclosed: Jsonify<Record<keyof Data, never>>, secret: Jsonify<Data>) {
+    const result: Partial<Jsonify<Data>> = {};
+    const keys: (keyof Jsonify<Data>)[] = this.keys ?? (Object.keys(secret) as any);
+
+    for (const key of keys) {
+      result[key] = secret[key];
+    }
+
+    return result as Jsonify<Data>;
+  }
+}