Health Connect platform tests

Include different tests for the platform APIs:

• cts - required for the platform release. Test platform API behaviour, not the implementatation. Included to the compatability and mainline tests suites.
• unittests - small tests, test apis implementation. Included to the mainline tests suite.
• PermissionIntegrationTests - integration tests for the permission flow implementation. Require signature permission, not included to the compatability and mainline tests suites.