Adding Dex IDP OIDC support

[mamy-CS]

• Adding User management automation supporting various IAM instances using Dex (https://dexidp.io/)
• Initial experimentation with Openldap as a connector to Dex
• Implemented oidc configuration, signout, signin feature, reading roles attributes and rendering accordingly using React OIDC (https://github.com/authts/oidc-client-ts)
• Automation of code using keycloak or dex