Would it be possible to add support of async serializer?

System.Text.Json IAsyncEnumerable serialization
If you want to serialize IAsyncEnumerable in net6+ app you need to use JsonSerializer.SerializeAsync() method
IRestSerializer does not allow to await inside Serializer() as it's synchronious method.
Temporary solution - using GetAwaiter().GetResult() - but this approach doesn't offer "true" async support