Support multiple loggers

[canny]

At the moment it is not easy to use Pact together with Spring Boot and log4j. When you start to exclude logback, Pact fails and when you add it, Spring Boot fails (because it then also tries to use logback).

It would be good if the concrete logging can be outsourced and a log4j support-jar can be created. This happens for example if you use Spring tests together with Pact.

https://pact.canny.io/admin/board/feature-requests/p/support-multiple-loggers

[canny]

This issue has been linked to a Canny post: Support multiple loggers 🎉