Add Azure AD implementation

[GuillaumeBrn]

The goal of this pull request is to implement AzureAD directly without having to use OIDC which is painful to deploy (I couldn't do it). It's basically adding the needed variables into the Python script and adding some new options in config.php and bootstrap.php (that will now be rendered also as it contain a variable). I've just followed these steps : https://github.com/MISP/MISP/tree/2.4/app/Plugin/AadAuth.

[GuillaumeBrn]

Hey, would it be possible to have some update? (sorry if I missed smth, I'm not very familiar with GitHub).