add invite blocking support plus msc4494 support

To accomplish this I also reworked how account data is stored and added a method to fetch capabilities, and another method to set account data

lib/models/account_data.dart

@@ -1,16 +1,69 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
 part "account_data.freezed.dart";
 part "account_data.g.dart";
 
 @freezed
 abstract class AccountData with _$AccountData {
+  const AccountData._();
+  static List<dynamic>? readRecentEmojiValue(
+    Map<dynamic, dynamic> json,
+    String key,
+  ) => json[key]?["recent_emoji"];
+
+  static Map<String, List<dynamic>>? recentEmojiToJson(
+    IList<RecentEmoji> recentEmoji,
+  ) => {"recent_emoji": recentEmoji.map((emoji) => emoji.toJson()).toList()};
+
   const factory AccountData({
-    required String userId,
-    required String? roomId,
-    required String type,
-    required dynamic content,
+    @JsonKey(name: InvitePermissionConfig.key)
+    @Default(InvitePermissionConfig())
+    InvitePermissionConfig invitePermissionConfig,
+
+    @JsonKey(name: "m.direct")
+    @Default(IMap.empty())
+    IMap<String, IList<String>> directMessages,
+
+    @JsonKey(
+      name: "m.recent_emoji",
+      readValue: AccountData.readRecentEmojiValue,
+      toJson: AccountData.recentEmojiToJson,
+    )
+    @Default(IList.empty())
+    IList<RecentEmoji> recentEmoji,
   }) = _AccountData;
 
   factory AccountData.fromJson(Map<String, Object?> json) =>
       _$AccountDataFromJson(json);
 }
+
+@freezed
+abstract class InvitePermissionConfig with _$InvitePermissionConfig {
+  static const key = "m.invite_permission_config";
+
+  const factory InvitePermissionConfig({
+    @JsonKey(unknownEnumValue: DefaultInviteAction.allow)
+    @Default(DefaultInviteAction.allow)
+    DefaultInviteAction defaultAction,
+  }) = _InvitePermissionConfig;
+
+  factory InvitePermissionConfig.fromJson(Map<String, Object?> json) =>
+      _$InvitePermissionConfigFromJson(json);
+}
+
+@freezed
+abstract class RecentEmoji with _$RecentEmoji {
+  const factory RecentEmoji({required String emoji, required int total}) =
+      _RecentEmoji;
+
+  factory RecentEmoji.fromJson(Map<String, Object?> json) =>
+      _$RecentEmojiFromJson(json);
+}
+
+@JsonEnum(fieldRename: .snake)
+enum DefaultInviteAction {
+  allow,
+  deny,
+  @JsonValue("uk.timedout.msc4494.deny_public")
+  denyPublic,
+}