Default telemetry views for folders

[akhenry]

Is your feature request related to a problem? Please describe.
When viewing a folder containing telemetry objects we should attempt to show telemetry for those objects in some useful way.

Describe the solution you'd like

1. LAD Table view of the telemetry objects in the folder. This is low-hanging fruit since we already do this for aggregates in the openmct-yamcs plugin using a method that is also applicable to folders.
2. A stacked plot view of the telemetry in the folder.