feature request: add "show extra field" in visualisation

[danielmotaleite]

On visualization, using the mouse over, we can see the a popup windows with the field that are requested in the visualization. It would be great if we could add more fields to that popup, via a "show extra fields"

If the extra field only have one element, show it
if it is empty, show -
if multiple elements, either show a count of unique values, or a list of all values or the top # values.

A perfect solution would be letting the user choose, for small fields, we could show a list of the various values (like environment: [ QA, Staging ]), for long fields, the unique count could be useful (client_ip: 123 unique values), or a top ( client_ip: top 3 values: 1.2.3.4 ; 1.2.3.5; 6.7.8.9)

This could allow more info to be extract and reduce the need for multiple queries to search for that info.
Specially on dashboards, this can be very useful as can allow one operator to simply mouse-over to see some extra info about a problem and get quicker problem reaction

[stratoula]

Duplicate of #106024