Add a flag for keeping app work even if its declared sdk-library dependency is unavailable

Bug: 295827951
Test: presubmit
Change-Id: I47b695d18af98d3b27eaf366c58a36571b1da6a8

core/java/android/content/pm/flags.aconfig

@@ -50,3 +50,11 @@ flag {
     description: "Feature flag to enable the features that rely on new ART Service APIs that are in the VIC version of the ART module."
     bug: "304741685"
 }
+
+flag {
+    name: "sdk_lib_independence"
+    namespace: "package_manager_service"
+    description: "Feature flag to keep app working even if its declared sdk-library dependency is unavailable."
+    bug: "295827951"
+    is_fixed_read_only: true
+}