Enable Business Calendars

[pefernan]

We must reenable the Business Calendar capabilty for processes. Currently Business Calendars aren't available in the process environment and cannot be loaded. Additionally the actual BusinessCalendarImpl is using the wrong classloader to load the calendar.properties file.

In order to sort this out, we should make BusinessCalendar injectable in the ProcessConfig, so it can be later set into the process environment. We may need to have a BusinessCalendarProducer(quarkus/springboot) generated during the codegen (only if the calendar.properties is present in the project).

Then if the Calendar is correctly injected we should be able to get from the application configuraition when creating the DummyKnowledgeRuntime and set it into the Environment using the right key, so it will be available for the process engine.