Container should have a default data source

[DnOberon]

Reason

We need to reduce some complexity for entry level users of DeepLynx

Upon creating a container, the user should also be provisioned a default, enabled data source.

Further, each new user in the container should start with this default same data source.

Design

It's possible that this feature is more appropriate at a later date, for example after we ramp up work on DeepLynx NextJS. I have laid some groundwork for better state management - e.g. persisting data source selection throughout the app - in DeepLynx NextJS

Medium priority based on what Peter + NRIC may decide, otherwise low priority

Impact

I think we can just add an API call behind the scenes to the container creation workflow