Currently it is possible to configure folders in JCasC using Groovy syntax via JobDSL. It would be cool if the Folders Plugin had a native configurator so that JCasC could configure objects using YAML definition. 

Acceptance criteria:

• There is a way to define folder structure using JCasC
• It is possible to define folders and folder properties in YAML
• It is possible to define ComputedFolders via JCasC (e.g. GitHub Org Folder)
• Nice2have: The implementation allows configuring jobs inside folders in the future. Likely in YAML, see the examples for Pipeline in https://github.com/jenkinsci/simple-pull-request-job-plugin