Add C++ facade for session config bindings, and test #806

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	43m 34s
build_attest_all (buildconfigs/oak_client_android_app.sh)	52m 44s
build_attest_all (buildconfigs/oak_containers_agent.sh)	37m 17s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	35m 15s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	51m 22s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	48m 26s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	49m 9s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	51m 46s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	53m 18s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	42m 32s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	43m 12s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	40m 30s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	43m 51s
build_attest_all (buildconfigs/oak_orchestrator.sh)	43m 26s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	43m 41s
build_attest_all (buildconfigs/stage0_bin.sh)	43m 49s
build_attest_all (buildconfigs/stage0_bin_tdx.sh)	43m 54s
	12h 47m 46s

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