[Large screen] Make slice deep linking to Settings show in 2-pane

- add a standalone home activity for slice deep link.
- add EXTRA_IS_FROM_SLICE to control the slice deep link flow.
- Intent#parseUri fails if the intent data schema is set.
  Add EXTRA_SETTINGS_LARGE_SCREEN_DEEP_LINK_INTENT_DATA to relay the
  data schema.

Bug: 201397123
Test: manual, robotest
      1.  Say 'Enable NFC'/'Enable Bluetooth'to Google assistant.
      2.  Click the the NFC/BT Slice.
Change-Id: Ia3216956328c32b2109cb2d70ad1105327661f26

src/com/android/settings/homepage/SliceDeepLinkHomepageActivity.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2021 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.homepage;
+
+import android.content.ComponentName;
+
+/** Activity for Slices to launch Settings deep link page */
+public class SliceDeepLinkHomepageActivity extends SettingsHomepageActivity {
+    @Override
+    protected ComponentName getDeepLinkComponent() {
+        return new ComponentName(getApplicationContext(), getClass());
+    }
+}