Write RemoteViews actions to proto (1/3)

This change adds support for writing the following RemoteViews actions to
proto:
  AttributeReflectionAction
  BitmapReflectionAction
  ComplexUnitDimensionReflectionAction
  LayoutParamAction
  NightModeReflectionAction
  ReflectionAction
  RemoveFromParentAction

Test: RemoteViewsProto test
Bug: 308041327
Flag: android.appwidget.flags.remote_views_proto
Change-Id: I3b191abdb518123c3f5d2c0ed5be1672c4fd21cd