[ROSP] Add ColorsModel for StatusBarPopupChips

This CL makes the popup chips color scheme configurable by introducing ColorsModel.
Additionally, the PopupChipModel has been moved into the UI layer
which is the most appropriate layer for it.

Bug:413207866
Test: Make sure the media control chip UI is unchanged
Flag: com.android.systemui.status_bar_popup_chips

Change-Id: Ia91dcf9b48e1042095829e6c109a94d751c915c8