CustomPublisherConfiguration for Publishers

[cdsap]

Abstract the creation of CustomPublishers with a configuration like:

class CustomPublisherConfiguration : PublisherConfiguration {
    override var name = "CustomPublisherConfiguration"
    override var publishBuildMetrics = true
    override var publishTaskMetrics = true
    val publisher: Publisher? = null
} 

This will help us to include custom publishers in the HybridPublisher and have a better syntax in the main publisher configuration