[DesktopStatusBar] Move HighlightChip

We will need to use ShadeHighlightChip in the status_bar.
This change moves it into a separate file and makes it
public.

Bug: 433589833
Flag: com.android.systemui.status_bar_for_desktop
Test: N/A
Change-Id: Ia437b78018714258312810e7faee1db8f58302d2