Added layer of security, we encrypt the API key and related secret.
It requires setting up some encryption keys that can be generated wiht
`bin/rails db:encryption:init`
The VINE Api require a secret and an API key to be used. The secret is
used to sign the request. The secret is linked to the API key so we need
to store it along side the key.
Using namespace subfolder to help organise it and show the inheritance.
Hmm, instead of scopes, we could have different has_many relationships on the Enterprise. Maybe it should be in a concern. We can refactor later I guess.
