Upload and create a compound document

We want a new FileManager plugin that takes as input a ZIP file and creates a Compound Document structure with the ZIP entries.
The root document type will be CompoundDocument with the ZIP filename as name/title (minus the extension). All ZIP entries will be used to create the children documents, using the FileManager service:

• folder entries will be of type CompoundDocumentFolder.
• file entries will be created using the FileManager in the right folder.

It's probably worth creating a new CompoundDocumentService that will handle the document and structure creation (as in the existing add-on).

Acceptance tests:
Assuming I have a compound document in a pre-formatted ZIP file, as a user I can upload this ZIP file through the REST API and import it into a given folder on my Nuxeo server. As a result, I can see that my compound document was detected and the whole hierarchy was created:

• the root document is of type CompoundDocument
• files are either of type File, Picture Video or Audio
• folders are of type CompoundDocumentFolder

Existing add-on with some logic to take back if needed: https://github.com/nuxeo-sandbox/nuxeo-compound-document/