[Security] Add Egress Gateway #423
Description
Problem
Security Gaps https://docs.google.com/document/d/1TD5HHy-VKZSt2H__f-V5FS5793ESjK1Uu-Jo5KYi6js/edit?tab=t.0
Proposed Solution
To have a true Zero Trust architecture, add Egress gateway to handle token validation and all workflows. This will be heavily audited
Example: when a handler is called in PDP, a function in Egress gateway validates the signature (whether PDP response is for the original data requested). Same for CE
Alternatives
No response