cilogon oauth integration

[panta-123]

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Description

Please describe briefly your pull request.
a. Added CILOGON oauth integration (as an folder in contrib, similar to keycloak)
b. Ability to have group based login (added group handler)
c. New allowed group is created /updated at login.
d. Added pytest to cilogon (all passing)
e. All documented in init.py in cilogon.

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• [ x] I'm aware of the code of conduct.
• [ x] I've created logical separate commits and followed the commit message format.
• [ x] I've added relevant test cases.
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[panta-123]

@ntarocco and/or @slint , would you be able to review this ?

Since it is oauth integration, I think it must be pass all the security compliance.