[PIM-232] Configure product datagrid displayed columns and their order

```
Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Unit test passes: yes
Specs passes: yes
Replaced unit test classes removed: yes
Behat scenario passes: ?
Checkstyle issues: ?
ChangeLog updated: no
Documentation PR: 
Fixes the following jira:
 - PIM-232
```