[PM-6400] Move core FIDO2 code from vault to platform ownership (#8044)

* [PM-6400] Move core FIDO2 code from vault to platform ownership

- lib/common/vault/abstractions/fido2 -> lib/common/platform/abstractions/fido2
- lib/common/vault/services/fido2 -> lib/common/platform/services/fido2

* [PM-6400] fix: wrong imports

libs/common/src/platform/services/fido2/fido2-utils.spec.ts

@@ -0,0 +1,40 @@
+import { Fido2Utils } from "./fido2-utils";
+
+describe("Fido2 Utils", () => {
+  const asciiHelloWorldArray = [104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100];
+  const b64HelloWorldString = "aGVsbG8gd29ybGQ=";
+
+  describe("fromBufferToB64(...)", () => {
+    it("should convert an ArrayBuffer to a b64 string", () => {
+      const buffer = new Uint8Array(asciiHelloWorldArray).buffer;
+      const b64String = Fido2Utils.fromBufferToB64(buffer);
+      expect(b64String).toBe(b64HelloWorldString);
+    });
+
+    it("should return an empty string when given an empty ArrayBuffer", () => {
+      const buffer = new Uint8Array([]).buffer;
+      const b64String = Fido2Utils.fromBufferToB64(buffer);
+      expect(b64String).toBe("");
+    });
+
+    it("should return null when given null input", () => {
+      const b64String = Fido2Utils.fromBufferToB64(null);
+      expect(b64String).toBeNull();
+    });
+  });
+
+  describe("fromB64ToArray(...)", () => {
+    it("should convert a b64 string to an Uint8Array", () => {
+      const expectedArray = new Uint8Array(asciiHelloWorldArray);
+
+      const resultArray = Fido2Utils.fromB64ToArray(b64HelloWorldString);
+
+      expect(resultArray).toEqual(expectedArray);
+    });
+
+    it("should return null when given null input", () => {
+      const expectedArray = Fido2Utils.fromB64ToArray(null);
+      expect(expectedArray).toBeNull();
+    });
+  });
+});