Arvados » Arvados Workbench 2

As a user I would like edit name and description of a collection
so that I can personalize it according to my goals.

Acceptance criteria:
- modal with inputs "Collection name" and "Description"
- collection name must be unique so it need to be validated
- after successful action, snackbar appears with information that "Collection has been edited".

Mockup: https://3czrf1.axshare.com/#g=1&p=4_3_collection&c=1

User flow:

1. Click on "more options" icon.

2. Click on "edit collection".

3. Edit collection.

4. Click on "Save" button.

5. Collection name is validated.

5. (successful action) Snackbar appears with information that "Collection has been edited".