Fork matrix-auth into this plugin

[timja]

see jenkinsci/matrix-auth-plugin#145 (comment)

Testing done

• Tested JCasC
• Configuring users in global and project configuration

There is certainly risk to this but I've done my best checking it.

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6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[KalleOlaviNiemitalo]

In jenkinsci/matrix-auth-plugin#144, hpi.compatibleSinceVersion was raised because the Pipeline and Job DSL syntaxes changed. Does this PR cause a similar incompatibility in azure-ad?

[timja]

👉 #461