This adds an AES-GCM 256bit encryption layer for storage for sensitive items. This is only TOTP secrets for the time being but this may be expanded later. This will require a configuration change as per https://www.authelia.com/docs/configuration/migration.html#4330.
Closes#682
This change adds a new integration testing suite "CLI".
The intent of this suite is to test, validate and capture coverage for Authelia's commands via the CLI.
