TRON: Count smart selection events.

Logs:
 - Smart selection occured
 - TextView menu item activated on smart selection
 - Smart selection reset
 - Smart selection modified

Test: Manually checked logging happens as per go/tron-howto and verified
nothing is broken in related classes by running:
bit FrameworksCoreTests:android.view.textclassifier.TextClassificationManagerTest
bit FrameworksCoreTests:android.widget.TextViewActivityTest

Bug: 32572232
Change-Id: Ia9081d92ae9aea50d863455be770eecd0c73be1a