Add payment activation capability.

app/src/main/java/org/thoughtcrime/securesms/recipients/Recipient.java

@@ -1024,6 +1024,10 @@ public class Recipient {
     return capabilities.getPnpCapability();
   }
 
+  public @NonNull Capability getPaymentActivationCapability() {
+    return capabilities.getPaymentActivation();
+  }
+
   public @Nullable byte[] getProfileKey() {
     return profileKey;
   }
@@ -1213,6 +1217,10 @@ public class Recipient {
       return value;
     }
 
+    public boolean isSupported() {
+      return this == SUPPORTED;
+    }
+
     public static Capability deserialize(int value) {
       switch (value) {
         case 0:  return UNKNOWN;