feat(core,host): initial aggregation API #619

Job	Run time
Test raiko-lib	1m 12s
build-test-native / Build and test native / Build and test	7m 46s
build-test-risc0 / Build and test risc0 / Build and test	26m 25s
build-test-native / Run integration tests on native / Build and run integration	4m 11s
build-test-risc0 / Run integration tests on risc0 / Build and run integration	11m 51s
build-test-sgx-all / Build and test sgx / Build and test	7m 59s
build-test-sgx-all / Build and test sgx in hardware / Build and test sgx in hardware	19m 8s
build-test-sgx-all / Build and test sgx with Docker / Build and test sgx with Docker	5m 10s
build-test-sgx-all / Run integration tests on sgx / Build and run integration	4m 43s
build-test-sp1 / Build and test sp1 / Build and test	32m 36s
build-test-sp1 / Run integration tests on sp1 / Build and run integration	10m 50s
	2h 11m 51s

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