Define Attester and Endorser gRPC services #496

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	5m 35s
build_attest_all (buildconfigs/oak_client_android_app.sh)	49m 45s
build_attest_all (buildconfigs/oak_containers_agent.sh)	6m 42s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	28m 36s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	8m 35s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	7m 4s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	8m 5s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	15m 19s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	18m 2s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	5m 0s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	5m 1s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	5m 42s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	4m 56s
build_attest_all (buildconfigs/oak_orchestrator.sh)	5m 13s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	18m 16s
build_attest_all (buildconfigs/stage0_bin.sh)	43m 39s
	3h 55m 30s

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