Add feature requirement annotation

import android.annotation.IntDef;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.annotation.RequiresFeature;

import android.annotation.RequiresPermission;

import android.annotation.SystemService;

import android.annotation.TestApi;

import android.content.ComponentName;

import android.content.Context;

import android.content.IntentSender;

import android.content.pm.PackageManager;

import android.os.Binder;

import android.os.Bundle;

import android.os.CancellationSignal;

 * to authenticate to the app.

 */

@SystemService(Context.CREDENTIAL_SERVICE)

@RequiresFeature(PackageManager.FEATURE_CREDENTIALS)

public final class CredentialManager {

    private static final String TAG = "CredentialManager";

    private static final Bundle OPTIONS_SENDER_BAL_OPTIN = ActivityOptions.makeBasic()