Add Thread resource overlay support

This CL adds resource overlay support to allow developers to
change the default configuration of using the location country code.

Bug: b/311324956
Test: Set the resource overlay in cuttlefish, check the default
      configuration via the command `dumpsys thread_network`.

Change-Id: Ide853975e8244f06a382b2eda4844e030539b95d
diff --git a/thread/tests/unit/Android.bp b/thread/tests/unit/Android.bp
index 74b4a35..c7887bc 100644
--- a/thread/tests/unit/Android.bp
+++ b/thread/tests/unit/Android.bp
@@ -39,12 +39,14 @@
         "guava-android-testlib",
         "mockito-target-extended-minus-junit4",
         "net-tests-utils",
+        "service-connectivity-pre-jarjar",
         "service-thread-pre-jarjar",
         "truth",
     ],
     libs: [
         "android.test.base",
         "android.test.runner",
+        "ServiceConnectivityResources",
     ],
     jarjar_rules: ":connectivity-jarjar-rules",
     jni_libs: [