Add capability to download LATEST version of template-sets

[jan-vcapgemini]

As a CobiGen user, I want to add a template-set artifact to my properties file e.g. template-sets.installed=com.devonfw.cobigen:crud-java-server-app without a version number so that CobiGen will always download the latest available version.

Hints:

• https://www.baeldung.com/java-comparing-versions
• ArtifactRetriever.retrieveTemplateSetJarDownloadURLs method
• DownloadTemplateSetsIT.testDownloadTemplateSetWithoutVersionPropertyDownloadsLatestVersion test