Refactor AppPicker to adopt the latest UX

- get rid of ListActivity
- add aconfig

Bug: 299195099
Test: manual
Change-Id: I922ffb46f3132d117b0f682d8076f9e975d02b2c
diff --git a/Android.bp b/Android.bp
index 2699c38..045a963 100644
--- a/Android.bp
+++ b/Android.bp
@@ -94,6 +94,7 @@
         "battery-event-protos-lite",
         "battery-usage-slot-protos-lite",
         "contextualcards",
+        "development_settings_flag_lib",
         "factory_reset_flags_lib",
         "fuelgauge-log-protos-lite",
         "fuelgauge-usage-state-protos-lite",