Secret storage

[pverheggen]

Currently the config has a single storage option which is used to store all data. Devs should optionally be able to provide a separate storage adapter so that keys can be stored separately from auth data.

This is a good security measure because if your database has a SQL injection vulnerability, for example, it doesn't compromise the private key.

Example providers would be AWS Secrets Manager or Cloudflare Secrets Store.

[thdxr]

this is in support of stepping towards something like #54

[Cmion]

@thdxr I think this would be for storing public/private oauth keys