Improve dream logs.

This change adds/refactors the following logs around dreams:
- add/remove a dream complication
- show/hide a dream status bar item
- dream overlay active state changed
- low light mode active state changed
- assistant attention state changed
- status bar visible state changed
- available complication types changed
- should show complications state changed

Bug: 284167849
Fix: 284167849
Test: adb bugreport and verify logs are present
Change-Id: I3771c527e3cfd571bdae641a2fb6f49100191199