[SB][RON] Add demo commands for showing example RON chips.

This CL:
1) Adds a new `DemoRonCommand` that lets users show a RON chip for a
   specific package using adb.
2) Hooks up those demo adb commands to the rest of the chip
   architecture.

Bug: 361346412
Flag: com.android.systemui.status_bar_ron_chips
Test: `adb shell cmd statusbar demo-ron -p com.android.systemui` ->
verify status bar chip shows with SysUI icon
Test: verify call chips and screen share chips still work as expected
Test: atest DemoRonChipViewModelTest OngoingActivityChipsViewModelTest

Change-Id: I0f391d1d557edc78057a999e6b3b6d07ca463b49