Problem

Although config management within SSO is fairly straightforward at the moment, it is also unorganised and doesn't leave much room for extension. Particularly in the sense of multi-provider workflows or for storing the config elsewhere (e.g. remote config). Fulfilling these workflows right now config wise is tricky.

Solution

Implement a new set of methods to manage config variables using a new package dependency such as Viper.
This PR currently introduces back-end changes that allow us to achieve this goal, while retaining functionality and flow (the same things are passed in, and the same things are returned).

Near-future PR's will include further changes to mould the usage of Viper to better fit our needs.