Add sendPaymentNotification dbus method

Closes #1010

src/main/java/org/asamk/Signal.java

@@ -62,6 +62,8 @@ public interface Signal extends DBusInterface {
             String emoji, boolean remove, String targetAuthor, long targetSentTimestamp, List<String> recipients
     ) throws Error.InvalidNumber, Error.Failure;
 
+    long sendPaymentNotification(byte[] receipt, String note, String recipient) throws Error.Failure;
+
     void sendContacts() throws Error.Failure;
 
     void sendSyncRequest() throws Error.Failure;

src/main/java/org/asamk/signal/dbus/DbusManagerImpl.java

@@ -388,7 +388,8 @@ public class DbusManagerImpl implements Manager {
     public SendMessageResults sendPaymentNotificationMessage(
             final byte[] receipt, final String note, final RecipientIdentifier.Single recipient
     ) throws IOException {
-        throw new UnsupportedOperationException();
+        final var timestamp = signal.sendPaymentNotification(receipt, note, recipient.getIdentifier());
+        return new SendMessageResults(timestamp, Map.of());
     }
 
     @Override

src/main/java/org/asamk/signal/dbus/DbusSignalImpl.java

@@ -298,6 +298,21 @@ public class DbusSignalImpl implements Signal {
         }
     }
 
+    @Override
+    public long sendPaymentNotification(
+            final byte[] receipt, final String note, final String recipient
+    ) throws Error.Failure {
+        try {
+            final var results = m.sendPaymentNotificationMessage(receipt,
+                    note,
+                    getSingleRecipientIdentifier(recipient, m.getSelfNumber()));
+            checkSendMessageResults(results);
+            return results.timestamp();
+        } catch (IOException e) {
+            throw new Error.Failure(e.getMessage());
+        }
+    }
+
     @Override
     public void sendTyping(
             final String recipient, final boolean stop