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

frontend/pweb/lib/models/payment/multiple_payouts/csv_row.dart

@@ -5,6 +5,7 @@ class CsvPayoutRow {
   final int expMonth;
   final int expYear;
   final String amount;
+  final String? comment;
 
   const CsvPayoutRow({
     required this.pan,
@@ -13,5 +14,6 @@ class CsvPayoutRow {
     required this.expMonth,
     required this.expYear,
     required this.amount,
+    this.comment,
   });
 }