Add traces for notification inflation performance improvement targets

Add traces to ShadeNode#addChildAt, ShadeNode#moveChildTo, and
ShadeNode#removeChild to track the runnings of
ShadeListBuilder.buildList with Node modifications.
Add traces to updateNotificationsOnUiModeChanged.
The additional traces provide a means to monitor the progress of our
improvement goals, specifically aimed at reducing main-thread inflation
caused by notifications.

Test: Manual with Perfetto
Bug: 303300622
Change-Id: I72d929bb751c8437c58f9cf2f86e1c94ec0fbfdd