Make it possible to declare a new audit event type from Studio and that it can be fired in an operation.

There should be a new Studio tree configuration point called "Business audit entries" where we can declare a new event name and the associated category.

Then, there must be an new operation that is "fire audit entry" that takes a document,documents as input and produces document,documents, and log for each document the specific event.
This operation has a parameter that is the "comment" and that can uses contextual values to be filled