Implement mod_cluster Jetty integration

According to https://developer.jboss.org/thread/252385 :

A Jetty module would simply need to implement the interfaces found in the mod_cluster-container-spi module.

The interfaces in question are at https://github.com/modcluster/mod_cluster/tree/master/container/spi/src/main/java/org/jboss/modcluster/container

If I wanted to implement this myself, what would be required from my side to start working on this? What suggested reading should I do and what JBoss/Jetty concepts must I understand before trying to implement mod_cluster integration in Jetty?

This is a mirror of the GitHub issue at https://github.com/eclipse/jetty.project/issues/2261