Introduce Oak Standalone Connector type #132

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	2m 18s
build_attest_all (buildconfigs/oak_client_android_app.sh)	43m 28s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	24m 23s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	5m 15s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	3m 58s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	4m 38s
build_attest_all (buildconfigs/oak_containers_agent.sh)	3m 22s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	11m 27s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	2m 13s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	2m 7s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	2m 30s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	2m 17s
build_attest_all (buildconfigs/oak_orchestrator.sh)	2m 6s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	2m 53s
build_attest_all (buildconfigs/stage0_bin.sh)	2m 38s
	1h 55m 33s

Provide feedback