[LLC, Persistence] Add doc comments

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_persistence/lib/src/entity/users.dart

@@ -1,22 +1,31 @@
 import 'package:moor/moor.dart';
 import 'package:stream_chat_persistence/src/converter/map_converter.dart';
 
+/// Represents a [Users] table in [MoorChatDatabase].
 @DataClassName('UserEntity')
 class Users extends Table {
+  /// User id
   TextColumn get id => text()();
 
+  /// User role
   TextColumn get role => text().nullable()();
 
+  /// Date of user creation
   DateTimeColumn get createdAt => dateTime().nullable()();
 
+  /// Date of last user update
   DateTimeColumn get updatedAt => dateTime().nullable()();
 
+  /// Date of last user connection
   DateTimeColumn get lastActive => dateTime().nullable()();
 
+  /// True if user is online
   BoolColumn get online => boolean().nullable()();
 
+  /// True if user is banned from the chat
   BoolColumn get banned => boolean().nullable()();
 
+  /// Map of custom user extraData
   TextColumn get extraData => text().nullable().map(MapConverter<Object>())();
 
   @override