Logging for fields added in KeyboardConfigured atom

Added logging for the ime_language_tag and ime_layout_type fields added
in the KeyboardCongigured atom. Also added default value for the
LayoutSelectionCriteria.
Added handling for null language tags.

Bug: 280421650
Test: atest FrameworksServicesTests:KeyboardMetricsCollectorTests
Change-Id: Ia83da586093f146201082d07750d27bc02546655