feat(dev): add secrets dev screen (used to recover corrupted wallet) (#2234)

* feat(dev): add secrets dev screen (used to recover corrupted wallet)

* fix(dev): decode only password fields

lib/view_model/dev/secure_preferences.dart

@@ -0,0 +1,75 @@
+import 'package:cake_wallet/core/secure_storage.dart';
+import 'package:cake_wallet/entities/encrypt.dart';
+import 'package:mobx/mobx.dart';
+
+part 'secure_preferences.g.dart';
+
+class DevSecurePreferences = DevSecurePreferencesBase with _$DevSecurePreferences;
+
+enum PreferenceType {
+  unknown,
+  string,
+  int,
+  double,
+  bool,
+  listString
+}
+
+abstract class DevSecurePreferencesBase with Store {
+  DevSecurePreferencesBase() {
+    secureStorageShared.readAll().then((value) {
+      values = value;
+    });
+  }
+
+  @observable
+  Map<String, String> values = {};
+
+  @computed
+  List<String> get keys => values.keys.toList()..sort();
+
+  @action
+  Future<void> delete(String key) async {
+    
+  }
+
+  dynamic get(String key) {
+    if (!values.containsKey(key)) {
+      return null;
+    }
+    if (!key.startsWith("MONERO_WALLET_")) return values[key]!;
+    try {
+      final decodedPassword = decodeWalletPassword(password: values[key]!);
+      return values[key]! + "\n\nDecoded: $decodedPassword";
+    } catch (e) {
+      return values[key]! +"\n$e";
+    }
+  }
+
+  Future<void> set(String key, PreferenceType type, dynamic value) async {
+    
+  }
+
+  PreferenceType getPreferenceType(String key) {
+    if (!values.containsKey(key)) {
+      return PreferenceType.unknown;
+    }
+    final value = values[key];
+    if (value is String) {
+      return PreferenceType.string;
+    }
+    if (value is bool) {
+      return PreferenceType.bool;
+    }
+    if (value is int) {
+      return PreferenceType.int;
+    }
+    if (value is double) {
+      return PreferenceType.double;
+    }
+    if (value is List<String>) {
+      return PreferenceType.listString;
+    }
+    return PreferenceType.unknown;
+  }
+}