Add new method 'requestServiceFeatures' in AppPredictionService. It allows Frontend to get backend service impl features info (e.g. feature readiness)

Bug: 292565550
Test: atest AppPredictionServiceTest
Change-Id: I0f2ec9ba0c1b332fa73afb461c29fe25de9b01e2
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index f5bf437..60ef8b4 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -48,6 +48,7 @@
     ":android.service.controls.flags-aconfig-java{.generated_srcjars}",
     ":android.service.dreams.flags-aconfig-java{.generated_srcjars}",
     ":android.service.notification.flags-aconfig-java{.generated_srcjars}",
+    ":android.service.appprediction.flags-aconfig-java{.generated_srcjars}",
     ":android.service.voice.flags-aconfig-java{.generated_srcjars}",
     ":android.speech.flags-aconfig-java{.generated_srcjars}",
     ":android.tracing.flags-aconfig-java{.generated_srcjars}",
@@ -112,6 +113,7 @@
         "android.provider.flags-aconfig",
         "android.security.flags-aconfig",
         "android.server.app.flags-aconfig",
+        "android.service.appprediction.flags-aconfig",
         "android.service.autofill.flags-aconfig",
         "android.service.chooser.flags-aconfig",
         "android.service.controls.flags-aconfig",
@@ -698,6 +700,19 @@
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
 
+// App prediction
+aconfig_declarations {
+    name: "android.service.appprediction.flags-aconfig",
+    package: "android.service.appprediction.flags",
+    srcs: ["core/java/android/service/appprediction/flags/*.aconfig"],
+}
+
+java_aconfig_library {
+    name: "android.service.appprediction.flags-aconfig-java",
+    aconfig_declarations: "android.service.appprediction.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}
+
 // Controls
 aconfig_declarations {
     name: "android.service.controls.flags-aconfig",