Arvados » Arvados Workbench 2

As a user I would like to see provenance graph
so that I can see the structure of the process

Acceptance criteria:
- structure of a workflow
- different sign for collections and processes
- zoom in and zoom out function
- collection and processes are clickable and linked
- information what is input and output

Example:
https://bkrem.github.io/react-d3-tree-demo/