Add a hidden extra key for caller number verification status.

This is used to work around a bug in the remote connection service API
where this property is not being passed through to Telecom.

Test: Use connection manager carrier and verify that VERSTAT is now
propagated to Telecom.
Bug: 192608283

Change-Id: Ie45e7c05d78623085cd2be32470a5870d243745c
diff --git a/telecomm/java/android/telecom/Connection.java b/telecomm/java/android/telecom/Connection.java
index 30403f4..759afd7 100644
--- a/telecomm/java/android/telecom/Connection.java
+++ b/telecomm/java/android/telecom/Connection.java
@@ -671,6 +671,14 @@
     public @interface AudioCodec {}
 
     /**
+     * Contains the same value as {@link #getCallerNumberVerificationStatus()}, except will be
+     * present in the {@link #getExtras()} using this key.
+     * @hide
+     */
+    public static final String EXTRA_CALLER_NUMBER_VERIFICATION_STATUS =
+            "android.telecom.extra.CALLER_NUMBER_VERIFICATION_STATUS";
+
+    /**
      * Connection extra key used to store the last forwarded number associated with the current
      * connection.  Used to communicate to the user interface that the connection was forwarded via
      * the specified number.