Color picker preview & apply pattern

Establish color picker preview & apply pattern. Also ensure
selected color option is updated when color is updated since the new
picker no longer restarts after color updates.

Flag: com.android.systemui.shared.new_customization_picker_ui
Test: ColorPickerViewModelTest
Bug: 350718581
Bug: 288312530
Change-Id: Ib992d0ed34eee8e6ec9bda820dd110c37d9a238a