[SB][Screen Chips] Rename call chip view-related items to be generic

This updates the view-related items for the ongoing call chip to be
generically named "ongoing activity chip" since we're going to reuse the
chip view for other activities that aren't ongoing calls.

It also moves the view-related classes to a new package:
`statusbar.chips.ui.view`.

Bug: 332662551
Test: atest ChipChronometerTest ChipBackgroundContainerTest
CollapsedStatusBarFragmentTest OngoingCallControllerTest
Test: verify ongoing call chip still works
Flag: NONE (just renames)

Change-Id: I4f1179a43a6c69d9b885f2dfa1c0c8de27696015