Expanded on node and edge data points. Implemented new helper methods (for...

Expanded on node and edge data points. Implemented new helper methods (for parsing, debugging, and generating data points).

Bug: 430583865
Test: manual (adb shell dumpsys activity --proto > activity.bin; m graph_ams; graph_ams activity.bin --format json > activity.json; look for 2 lists titled “nodes” and “links”, “nodes” objects should at the very least have “pid”, “name”, and “setAdj” properties; “links” objects should have “source”, “target”, “flagsFull”, and “flags” properties)

Flag: EXEMPTED tool update
Change-Id: Iafa4db9bfc710c7409c75c0b0e61ee262b52b236