Allow releasing runner class loader resources

[pedroigor]

Description
When doing CLI applications it might be necessary to make the re-augmentation process more transparent to users by issuing specific commands to the application, where these commands may have different options and logic that require configuring and parsing arguments using Picocli.

When doing re-augmentation on Windows, the JARs generated during the re-augmentation may be locked when the RunnerClassLoader is created thus failing to recreate these JARs.

Implementation ideas
Allow closing the RunnerClassLoader so that resources are released while still allowing these resources to be loaded again.

[pedroigor]

Fixed by #13157

[Sanne]

hi @pedroigor - did you mean to close this?