add support for initializing and resetting crypto identity

Fixes #137

lib/models/client_state.dart

@@ -12,9 +12,23 @@ class const ClientState({
   required final String? userId,
   required final String? deviceId,
   required final String? homeserverUrl,
+  final VerificationState verificationState = const .new(),
 }) with _$ClientState {
   Map<String, Object?> toJson() => _$ClientStateToJson(this);
 
   factory ClientState.fromJson(Map<String, Object?> json) =>
       _$ClientStateFromJson(json);
 }
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const VerificationState({
+  final bool stateChecked = false,
+  final bool hasCrossSigning = false,
+  @JsonKey(name: "has_ssss") final bool hasSecretStorage = false,
+}) with _$VerificationState {
+  Map<String, Object?> toJson() => _$VerificationStateToJson(this);
+
+  factory VerificationState.fromJson(Map<String, Object?> json) =>
+      _$VerificationStateFromJson(json);
+}