remove std dependency from opentelemetry package and add BUILD file s… #241

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	4m 15s
build_attest_all (buildconfigs/oak_client_android_app.sh)	48m 56s
build_attest_all (buildconfigs/oak_containers_agent.sh)	6m 56s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	28m 31s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	9m 24s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	5m 58s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	9m 16s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	16m 40s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	17m 5s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	4m 17s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	5m 27s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	4m 42s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	5m 41s
build_attest_all (buildconfigs/oak_orchestrator.sh)	5m 7s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	5m 35s
build_attest_all (buildconfigs/stage0_bin.sh)	4m 39s
	3h 2m 29s

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