Tags: GET tags endpoint should provide aggregation info

Gets a list of tags in the repository using the GET /tags endpoint should provide options to retrieve aggregation info as the number of times that a tag has been used.
This functionality is already present in share and it returns the entity :

url: "/collaboration/tagQuery?d=1490185245231&m=100&s=count&n=workspace%3A%2F%2FSpacesStore%2F1ee81bf8-52d6-4cfc-a924-1efbc79306b"

[

{ "name": "tagone", "count": 10 }

,

{ "name": "tagtwo", "count": 3 }

,

{ "name": "tagthree", "count": 1 }

]