Arvados » Arvados Workbench 2

As a user I would like to use data explorer with contents API
so that I could see all kind of data in the system

Acceptance criteria:
- connected contents api with data explorer
- provided filtering, sorting and pagination
- customized table for user needs (option to disable and enable columns: status, type, owner, file size, last modified)

User flow:
1. Click on specific project tab in tree context menu.

2. Specified view with table with content appears.