[CarTelemetryService] Add hello world kitchensink test

Bug: 200092147
Test: atest CarServiceUnitTest:DataBrokerTest
Test: manual testing
1. Flash seahawk
2. Open kitchen sink app
3. Click on Send MetricsConfig onGearChange
4. Verify status code is 0 (success)
5. Inject vehicle property event adb shell cmd car_service inject-vhal-event 0x11400400 2
6. Click on Get onGearChange Report
7. Wait a few moments and verify output is "Hello World!"

Change-Id: Ia599c19dbb927a6a5aed0c0c221e9648d6ae4c66
10 files changed
tree: e0c2cf0caea9e93fdb60f1e8ed9b89815268b546
  1. car-admin-ui-lib/
  2. car-internal-lib/
  3. car-lib/
  4. car-maps-placeholder/
  5. car-systemtest-lib/
  6. car-test-lib/
  7. car-usb-handler/
  8. car_product/
  9. cpp/
  10. data/
  11. experimental/
  12. FrameworkPackageStubs/
  13. obd2-lib/
  14. packages/
  15. procfs-inspector/
  16. service/
  17. tests/
  18. tools/
  19. user/
  20. vehicle-hal-support-lib/
  21. .clang-format
  22. .gitignore
  23. Android.mk
  24. CleanSpec.mk
  25. CPPLINT.cfg
  26. OWNERS
  27. PREUPLOAD.cfg
  28. README.md
  29. TEST_MAPPING
README.md

Native (C++) code format is required to be compatible with .clang-format file. Run

git clang-format --style=file --extension='h,cpp,cc' HEAD~

Note that clang-format is not desirable for Android java files. Therefore the command line above is limited to specific extensions.