added comment for payment, changed intent and added amount ui in operations

frontend/pshared/lib/data/dto/payment/payment.dart

@@ -11,6 +11,7 @@ part 'payment.g.dart';
 class PaymentDTO {
   final String? paymentRef;
   final String? state;
+  final String? comment;
   final PaymentResponseEndpointDTO? source;
   final PaymentResponseEndpointDTO? destination;
   final String? failureCode;
@@ -23,6 +24,7 @@ class PaymentDTO {
   const PaymentDTO({
     this.paymentRef,
     this.state,
+    this.comment,
     this.source,
     this.destination,
     this.failureCode,