Early Access created_at is not accessible via SDK

[keithhackbarth]

Add the created_at field that is in the API to SDK.

Why > We would like to add a "New" flag when early access features (opt-in features) have been created in the last two weeks. To highlight to our users that a new feature is available. Often they do not notice when new features are available. We are using this SDK but have our own custom UI.

In the backend, we can see that the EarlyAccess model has a create date field and also that it is listed in the EarlyAccess REST serializer. However, on the SDK side, this field seems to be not requested or not available (code is a little hard for me to tell). Adding this field would be very helpful for our use case. And this seems like a very small ask hopefully!