NXP-15380: Make #getUserDefaultCollections part of the Collection API

Conflicts:
	nuxeo-platform-collections/nuxeo-platform-collections-core/src/main/java/org/nuxeo/ecm/collections/api/CollectionManager.java

Conflicts:
	nuxeo-platform-collections/nuxeo-platform-collections-core/src/main/java/org/nuxeo/ecm/collections/api/CollectionManager.java
Merge branch 'feature-NXDRIVE-93-drive-edit'