ui[callgraph]: Add node search functionality to callgraph

[monicawoj]

Related to #304

The callgraph should be able to respond to user search, similar to the icicle graph.

Potential UI implementations:

1. On user search, the nodes and edges should turn to greyscale and the nodes that match the search should maintain their current hue.
2. Maintain current hues of all nodes/edges, but increase the size of the node that matches the search input & change its color to be distinct from the current hues.