Metrics wifi.proto for connected wifi score

(cherry picked from commit bb367b6)

Bug: 67429363
Bug: 71708302
Test: Wifi unit tests

Change-Id: I2993a02e7b3199c2b50dc2ddb7704fc5b6364025
Merged-In: I315613b8ea3aa1d02810ae376c76083d80865d31
(cherry picked from commit 1b8fe6e)

Author: Michael Plass

proto/src/wifi.proto

@@ -673,6 +673,10 @@ message StaEvent {
     // Framework initiated disconnect. Sometimes generated to give an extra reason for a disconnect
     // Should typically be followed by a NETWORK_DISCONNECTION_EVENT with a local_gen = true
     TYPE_FRAMEWORK_DISCONNECT = 15;
+
+    // The NetworkAgent score for wifi has changed in a way that may impact
+    // connectivity
+    TYPE_SCORE_BREACH = 16;
   }
 
   enum FrameworkDisconnectReason {
@@ -784,6 +788,9 @@ message StaEvent {
 
   // Authentication failure reason, as reported by WifiManager (calculated from state & deauth code)
   optional AuthFailureReason auth_failure_reason = 13 [default = AUTH_FAILURE_UNKNOWN];
+
+  // NetworkAgent score of connected wifi
+  optional int32 last_score = 14 [default = -1];
 }
 
 // Wi-Fi Aware metrics