[JENKINS-68404] Add ScriptUsageListener to track Groovy scripts

[meiswjn]

This PR relates to jenkinsci/jenkins#6539, jenkinsci/script-security-plugin#416 and https://issues.jenkins.io/browse/JENKINS-68404. It serves the purpose to track potentially dangerous usages of groovy scripts.

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[meiswjn]

With jenkinsci/jenkins#7056 being merged, I will continue on this PR soon :)

[PierreBtz]

Thanks! Most of the conflicts you'll see are due to the introduction of spotless on the codeline.

[jglick]

Still active?

[meiswjn]

Still active?

Since I would love to see this feature, yes. However, there are many other more pressing things right now, but I definitely want to do this. However, if someone stumbles upon this before I find time, feel free!