Add wireframe for biometric TestApis

1) Adds BiometricTestSession and empty implementations
2) Adds TEST_BIOMETRIC permission
3) Grants Shell USE_BIOMETRIC and TEST_BIOMETRIC permission

Bug: 169459906
Test: make -j update-api && make -j

Change-Id: Iea9fd37d7234eb7e5e34a7a2698cbf0ca7a33a77