JCR 2.0 defines new methods on javax.jcr.Workspace to create and delete workspaces. Because the Graph API does support this functionality, we should add support for these methods. Also, we need to add to the ModeShapePrivileges model so that it is possible to enable/disable this functionality.

Note that some JcrEngine configurations will not allow for creating and deleting workspaces. Each RepositorySource exposes its capability for creating workspaces, so this Workspace mechanism must take that into account and should expose it via the Repository.OPTION_WORKSPACE_MANAGEMENT descriptor. (For example, if the source for a JCR repository is a federated source that does not allow creating workspaces.)