Create factory for Jenkinsfile

[willr3]

We use Jenkinsfiles to control our benchmarks and we perform audits of them using grep but it would be helfpul to be able to parse their syntax to perform more complete analysis. There are two Jenkinsfile formats, declarative and scripted. We want everyone to use declarative but the parse should be able to identify the different without errors.
https://www.jenkins.io/doc/book/pipeline/syntax/

[johnaohara]

@willr3 what analysis do we need/want to do on Jenkinsfiles?

[willr3]

Verifying that all branches have a timeout, appropriate worker, current recommended horreumUpload syntax, etc

[johnaohara]

+1 makes sense for auditing