[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
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index a129ac1..7d9208c 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -391,6 +391,13 @@
 }
 
 flag {
+    name: "status_bar_ron_chips"
+    namespace: "systemui"
+    description: "Show rich ongoing notifications as chips in the status bar"
+    bug: "361346412"
+}
+
+flag {
     name: "compose_bouncer"
     namespace: "systemui"
     description: "Use the new compose bouncer in SystemUI"