Add additional touch handling logs for glanceable hub

This CL adds logging to TouchMonitor and its touch handlers, which are
used to open the shade and bouncer on the dream and hub.

Bug: 361091641
Test: N/A, just adding logging
Flag: NONE just adding logging
Change-Id: I1979354dbda1badc1ff5570c67af5442092e3ef6
8 files changed