zBuilder Add custom dependencies task

[dennis-behm]

This is a new task sample that allows to establish custom dependencies between files in your repository, that are not detected by the DBB scanners.

It's configuration based approach allows to establish and store dependencies in the DBB Metadatastore between source files and related files, such as configuration artifacts, based on matching basenames.

This allows and expanded ImpactAnalysis process to address scenarios like:

• The repository contains custom pkgbind configuration files, that need to be processed by the build framework (for example via the Transfer language task)
• The repository contains custom link configuration files, that need to be made available in build datasets, to be passed into the linkage editing process
• The repository contains custom test case files, that should execute once a corresponding module has been built