[RTT2] Add API for testing whether feature exists on platform

Add PackageManager API which allows apps to test whether the platform
officially supports the Wi-Fi RTT API.

Only start the RTT service if the device supports it.

Bug: 65014628
Test: integration tests pass
Change-Id: Ie88bd29ccd592e9a29ff24e8cc346afc360f03b0
3 files changed