CMS-4265 Duplicate Content - Introduce NodeService.duplicate

- introduced NodeService.duplicate
- added test
- removed embed param
CMS-4265 Duplicate Content - Introduce NodeService.duplicate

- introduced NodeService.duplicate
- added test
- removed embed param
- updated duplicate params Node -> NodeId
Merge pull request #1006 from enonic/cms-4265

CMS-4265 Duplicate Content - Introduce NodeService.duplicate