Add proactive hints container

This replaces all other chips containers and causes minimal
layout overhead: It is strictly within the task itself and
causes zero jank or space issues.

Screenshots:
https://drive.google.com/corp/drive/folders/1-3ZNCJtWc9_cgmP1nNd8U1yvpCr6GGoq
Test: manual
Change-Id: I5e22a34c4dc1ac3e73c4d5c913befc2360cb388e