[Chipbar] Add a #dump method.

Bug: 258019006
Test: `adb shell dumpsys activity service
com.android.systemui/.SystemUIService ChipbarCoordinator` -> dumps
current chipbar views
Test: `adb shell dumpsys activity service
com.android.systemui/.SystemUIService MediaTttChipControllerReceiver` ->
dumps current ttt receiver views

Change-Id: I4a63778f9497e5dcb88402ecfb673c4c753fd1a9
10 files changed