Allow advanced VPN to manage connection status via its UI

Bug: 238641532
Test: atest -c VpnSettingsTest
Change-Id: Ia6f1d84bba38bab7f13f46dc8a4fdb4eb0505f8f
Merged-In: Ia6f1d84bba38bab7f13f46dc8a4fdb4eb0505f8f

src/com/android/settings/vpn2/AdvancedVpnFeatureProvider.java

@@ -47,4 +47,9 @@ public interface AdvancedVpnFeatureProvider {
      * Returns {@code true} advanced vpn is removable.
      */
     boolean isAdvancedVpnRemovable();
+
+    /**
+     * Returns {@code true} if the disconnect dialog is enabled when advanced vpn is connected.
+     */
+    boolean isDisconnectDialogEnabled();
 }