Mutual Authentication between Clients and On-premises Server for TLS and JWT Identity integration for Server

[cmooney]

I would like to request a few stories be implemented for the Structuizr suite.

1. As a DevSecOps Engineer, I need to be able to configure the Structurizr tools for mutual authentication where the client presents an X509 certificate when challenged to establish TLS communications. This is especially so I can use a hardware token for authenticating the client.
2. As a DevSecOps Engineer, I want to be able to have the clients authenticate through an OAuth provider so that single sign-on can be achieved for Structuizr on-premises instances behind a reverse proxy.
3. As a DevSecOps Engineer, I need Structurizr On-premises to use JWTs passed to it as a user identity for any internal permissions management.
4. As a DevSecOps Engineer, I would like to be able to create an authorization plugin for Structurizr On-premisis so that I can delegate URL authorizations to another service

I am willing to fork the repository and submit pull requests to implement these stories.