Pass adapter session data to session callback

[babyccino]

Goals

Let the user access all the data stored in the adapter's session in the session callback

Non-Goals

No response

Background

There might be data you want to add to your session and have that returned from getServerSession() but at the moment the session callback receives only session.expires from the adapter's session

Proposal

When the strategy is set to "database" Pass the both the session and user from getSessionAndUser() to the session callback.