Add FeatureProvider for onboarding related settings

Add OnboardingFeatureProvider which will be used to B&R sound settings and
related tasks.
Bug: 289512753
Test: FakeFeatureFactory

Change-Id: I25e3b1f105ce0970cdf651400c153d8b4733029b

src/com/android/settings/onboarding/OnboardingFeatureProvider.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settings.onboarding
+
+import android.content.Context
+
+/**
+ * Provider for Onboarding related features.
+ */
+interface OnboardingFeatureProvider {
+    /**
+     * Mark this toggle preference has been changed.
+     * Called after [TogglePreferenceController.onPreferenceChange()].
+     *
+     * @param context App context
+     * @param preferenceKey The key to distinguish which preference has been changed.
+     */
+    fun markPreferenceHasChanged(context: Context, preferenceKey: String)
+}