Log widget taps

This change detects single tap events on widgets in the hub when it is
not in edit mode, and logs to statsd.

Test: atest CommunalMetricsLoggerTest
Test: atest CommunalViewModelTest
Test: statsd_testdrive 908
Bug: 317798449
Flag: com.android.systemui.communal_hub
Change-Id: Ie106a473f915b790bb7631b0f938404d9c24720b