Refactor TaskbarIconSpecs and TaskbarSpecsEvaluator

This cl includes
	- Because of IconNormalizer bug we are inflating iconsizes to match the specs.
	- specs changed from row x column to column X row.

Test: Presubmit
Bug: 356465292
Flag: com.android.launcher3.enable_taskbar_customization
Change-Id: I4b4856da92053149267e66a187f744c9c00ea3d9