Proto dump from SystemUI.

Needs to be called by doing `adb shell dumpsys statusbar --proto`
because using `dumpsys activity service` adds text to the dump.

Will also be dumped as part of the BR

Test: atest SystemUITests
Test: Used in CTS
Test: manual dump and BR
Fixes 237786667

Change-Id: I74abf65a76c059ea9bb5a14728192b6b683b7fc7