Context:
To show the current scope of a collection a new `Data Source` sub-navigation tab is to be created.

AT:

• Add a new tab called “Data Sources” to collection page sub navigation, as last item
• Tab and list is visible for all members of a collection
• the list contains the definition scope of the collection (collection/:id/scope)
  • Tenant(s) will be shown on each scope entry
• Provide our new list with search, create (create modal is out of scope of this task), empty state and no match found
• refer to definition scope api in the Collection endpoint documentation

Out of scope:

• unauthorized tenants
• hiding edit option for definitions with only not defined tenant
• add and edit sources modals

Design:
https://app.zeplin.io/project/5b4f294ab0d5cf0c2c391d1d/screen/5db2d50b166e2a8322e073b3