[DYN-2654] groups of nodes in graph should be displayed as group in tuneup list view

[ivaylo-matov]

Aims to address https://jira.autodesk.com/browse/DYN-2654 🤞

Displays Groups in TuneUp:

• Each grouped node is indented and positioned under the group header, regardless of the sorting order.
• Sorting can be based on total group execution time, group execution order, or group name.
• When sorting by execution order, if a group is removed, the execution order of the previously grouped nodes will not display, but the nodes will remain in the same location.
• When nodes are grouped, TuneUp will display the group and place the nodes under the header.
• The group will initially have its default name. If the name is changed, TuneUp will update it on the next graph run.
• If the color is changed, TuneUp will update it the next time the graph is loaded.

Hope that's okay.

[reddyashish]

LGTM