unblockUser method
Unblocks a user.
userId is the ID of the user to unblock.
Throws an exception if unblocking fails.
Implementation
Future<void> unblockUser(String userId) async {
try {
await service.unblockUser(
chatId: chatId,
userId: currentUserId,
blockedUserId: userId,
);
} catch (e) {
_error = e.toString();
notifyListeners();
rethrow;
}
}