View capture analyzer tree walker + Alpha jump detector V1

The analyzer is an utility that can be used from the test, and not only.
If an anomaly (such as a sudden jump of view’s coordinates between frames) is detected, the utility will throw an error.

The CL includes an early version of detectors for one of the anomalies we plan to detect: alpha jump (included), flash, position jump.

The analysis is currently not invoked from tests, we simply are adding the code.

Alpha jump detector:
The included alpha jump detector contains a long (but still incomplete) list of views for which we ignore alpha jumps. This list should go away after view capture data begins supporting fields like “ignore alpha jumps for this view”.

We currently detect only alpha jumps by 100%, i.e. when the view switches from completely opaque state to completely invisible or vice versa.

ScrimView treatment:
Since we don’t know at the moment whether ScrimView is opaque, we currently ignore all activity under it.

Bug: 286251603
Flag: N/A
Test: manually on Launcher hacked to invoke this analyzer
Change-Id: Ic86aff561a0c273afd7714d8287cb724bb2aecaf