TP: Provide the ability to view all cache groups assigned to a topology

[zrhoffman]

I'm submitting a ...

• new feature / enhancement request

Description

In Traffic Portal, users should be able to see all cache groups employed by a topology.

Traffic Control components affected ...

• Traffic Portal

Acceptance Criteria

• the topology cache groups view is accessible via a button on the edit topology page.
• the topology cache groups view is accessible via a deep link (i.e. tp.domain.com/!#/topologies/name/cache-groups).
• the topology cache groups view shows all cache groups employed by the topology in a tabular format.
• the topology cache groups view provides a method to edit an existing cache group.
  The line

See the Flexible Topologies PR for specifics: #4537