Adding afterRefetch hook

[adamjmcgrath]

Description

Like the AfterCallback hook gives you the opportunity to validate/add/remove claims when the session is created, the AfterRefetch hook allows you to validate/add/remove claims when the session is updated.

References

fixes #273

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

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