CAKE-343 | added wallet_addresses.dart, monero_wallet_addresses.dart, electrum_wallet_addresses.dart, wallet_addresses_credentials.dart, monero_wallet_addresses_credentials.dart and electrum_wallet_addresses_credentials.dart to the app; applied ElectrumWalletAddresses to electrum_wallet.dart and MoneroWalletAddresses to monero_wallet.dart; fixed contact_list_view_model.dart, other view models and services

lib/entities/wallet_addresses.dart

@@ -0,0 +1,30 @@
+import 'package:cake_wallet/entities/wallet_addresses_credentials.dart';
+import 'package:cake_wallet/entities/wallet_info.dart';
+
+abstract class WalletAddresses {
+  WalletAddresses(this.walletInfo) {
+    addresses = walletInfo?.addresses ?? {};
+  }
+
+  final WalletInfo walletInfo;
+
+  Map<String, String> addresses;
+
+  Future<void> update(WalletAddressesCredentials credentials);
+
+  Future<void> save() async {
+    try {
+      if (walletInfo == null) {
+        return;
+      }
+
+      walletInfo.addresses = addresses;
+
+      if (walletInfo.isInBox) {
+        await walletInfo.save();
+      }
+    } catch (e) {
+      print(e.toString());
+    }
+  }
+}

lib/entities/wallet_addresses_credentials.dart

@@ -0,0 +1 @@
+abstract class WalletAddressesCredentials {}