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);
+}

lib/models/gomuks_exception.dart

@@ -6,6 +6,12 @@ class GomuksException implements Exception {
   String? get errorCode =>
       RegExp(r"^(M_[A-Z_]+)").firstMatch(message)?.group(1);
 
+  /// The HTTP status code of the failed request
+  int? get statusCode => switch (RegExp(r"HTTP (\d{3})").firstMatch(message)) {
+    final match? => int.parse(match.group(1)!),
+    null => null,
+  };
+
   @override
   String toString() => message;
 }

lib/models/recovery_key.dart

@@ -0,0 +1,19 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:freezed_annotation/freezed_annotation.dart";
+
+part "recovery_key.freezed.dart";
+part "recovery_key.g.dart";
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(includeIfNull: false)
+class const RecoveryKey({
+  required final String recoveryKey,
+
+  required final IMap<String, dynamic> crossSigningKeys,
+  final IMap<String, dynamic>? passphraseMeta,
+}) with _$RecoveryKey {
+  Map<String, Object?> toJson() => _$RecoveryKeyToJson(this);
+
+  factory RecoveryKey.fromJson(Map<String, Object?> json) =>
+      _$RecoveryKeyFromJson(json);
+}