Add getUidFirewallRule to ConnectivityManager

Upcoming CLs use this method to add chain status to failure log of
ConnectivityManagerTest#testFirewallBlocking which is a flaky test

Test: m
Bug: 262141231
Change-Id: Ieb6b4402a3435571decbd8a26fdf666b2db732fe
diff --git a/service/src/com/android/server/ConnectivityService.java b/service/src/com/android/server/ConnectivityService.java
index 330a1da..92bfc87 100755
--- a/service/src/com/android/server/ConnectivityService.java
+++ b/service/src/com/android/server/ConnectivityService.java
@@ -11697,6 +11697,12 @@
         }
     }
 
+    @Override
+    public int getUidFirewallRule(final int chain, final int uid) {
+        enforceNetworkStackOrSettingsPermission();
+        return mBpfNetMaps.getUidRule(chain, uid);
+    }
+
     private int getFirewallRuleType(int chain, int rule) {
         final int defaultRule;
         switch (chain) {