Dynamic Compound Document type selection

Currently, the Compound Document type and Compound Document folder type are hardcoded to CompoundDocument and CompoundDocumentFolder.

We want to be able to dynamically choose a type and folder type based on the ZIP archive file.

To do that, 2 automation scripting operations will be added, one to get the Compound Document type, and another one for the folder type: javascript.GetCompoundDocumentType and javascript.GetCompoundDocumentFolderType.
The ids are prefixed by javascript. so that the operations can be easily overridden on Nuxeo Studio.

The default implementation of those operations will return CoumpoundDocument and CompoundDocumentFolder.