Add option to collapse subtree view and search in trees when monitoring

[TomNysWF]

Describe the solution you'd like
It would be great to also be able to collapse the sub-tree view and maybe even option to be able to search in these trees in the monitoring section of groot

[facontidavide]

collapse the sub-tree view

You should DEFINITIVELY give me more details

[TomNysWF]

Sorry, When i am monitoring our big tree's the menu on the right is one gigantic list of nested sub-trees, these are all expanded, meaning a huge scrollbar to go look for that one subtree that i want to enable the monitor for.

I have to go and collapse all of the subtrees just to go find the one i need to monitor

kinda related to #81.

[facontidavide]

if you are not comfortable sharing screenshots here, please contact me ad dfaconti@auryhnrobotics.com do discuss the details