This MP consolidates multiple related changes together, with the goal of:
(1.) Make the service instance accessible via a cli. Useful for testing scenarios.
(2.) To cut down time-to-first-fix (ttff) by:
(2.1) Leveraging SUPL and other supplementary data downloaded over ordinary data connections.
(2.2) Enabling network-based positioning providers to acquire fast position estimates.
In more detail:
* Added tests for daemon and cli.
* Unified daemon and cli header and implementation files.
* Add a command-line interface to the service.
* Split up provider selection policy to rely on an interface ProviderEnumerator to ease in testing.
* Trimmed down on types.
* Removed connectivity API draft to prepare for simpler approach.
* Refactored includes.
* Added a configuration option to handle cell and wifi ID reporting.
* Add a mock for a connectivity API exposed to providers and reporters.
* Add units for connectivity api.
* Refactor cell class into namespace radio. Fixes: 1226204, 1248973, 1281817