Load zen mode type icon options from the proper resources

* Move default mode icons from Settings res to core res.
* Add array resources for the icon options and their descriptions.
* As the initial version of the list, use the default mode icons.

Bug: 333901673
Test: atest IconOptionsProviderImplTest
Flag: android.app.modes_ui
Change-Id: I66669e67a9d607268c05d5ed3df6c9555e57864c

src/com/android/settings/notification/modes/IconOptionsProvider.java

@@ -17,12 +17,13 @@
 package com.android.settings.notification.modes;
 
 import androidx.annotation.DrawableRes;
+import androidx.annotation.NonNull;
 
 import com.google.common.collect.ImmutableList;
 
 interface IconOptionsProvider {
 
-    ImmutableList<IconInfo> getIcons();
+    @NonNull ImmutableList<IconInfo> getIcons();
 
     record IconInfo(@DrawableRes int resId, String description) { }
 }