Create Dart snippets and reference them

Co-Authored-By: ok300 <106775972+ok300@users.noreply.github.com>

snippets/dart_snippets/lib/list_payments.dart

@@ -0,0 +1,33 @@
+import 'package:breez_sdk/breez_sdk.dart';
+import 'package:breez_sdk/bridge_generated.dart';
+
+Future<List<Payment>> listPayments() async {
+  // ANCHOR: list-payments
+  ListPaymentsRequest req = ListPaymentsRequest(filter: PaymentTypeFilter.All);
+  List<Payment> paymentsList = await BreezSDK().listPayments(req: req);
+  print(paymentsList);
+  // ANCHOR_END: list-payments
+  return paymentsList;
+}
+
+Future<List<Payment>> listPaymentsFiltered({
+  DateTime? startDate,
+  DateTime? endDate,
+  bool? includeFailures,
+  int? offset,
+  int? limit,
+}) async {
+  // ANCHOR: list-payments-filtered
+  ListPaymentsRequest req = ListPaymentsRequest(
+    filter: PaymentTypeFilter.Sent,
+    fromTimestamp: startDate?.millisecondsSinceEpoch,
+    toTimestamp: endDate?.millisecondsSinceEpoch,
+    includeFailures: includeFailures,
+    offset: offset,
+    limit: limit,
+  );
+  List<Payment> paymentsList = await BreezSDK().listPayments(req: req);
+  print(paymentsList);
+  // ANCHOR_END: list-payments-filtered
+  return paymentsList;
+}