`no_std` support #83

Job	Run time
Test no_std support (dex)	4m 1s
Test no_std support (dex)	3m 58s
build	39s
build	28s
verify-proof (dex)	1m 1s
verify-proof (dex)	59s
Test no_std support (recursive)	4m 1s
Test no_std support (recursive)	4m 2s
verify-proof (recursive)	58s
verify-proof (recursive)	51s
verify-proof (recursive_with_poseidon)	1m 1s
verify-proof (recursive_with_poseidon)	1m 8s
Test no_std support (recursive_with_poseidon)	3m 44s
Test no_std support (recursive_with_poseidon)	4m 13s
verify-proof (small)	56s
verify-proof (small)	52s
Test no_std support (small)	4m 15s
Test no_std support (small)	3m 58s
verify-proof (starknet)	1m 1s
verify-proof (starknet)	1m 6s
Test no_std support (starknet)	4m 33s
Test no_std support (starknet)	4m 8s
verify-proof (starknet_with_keccak)	1m 1s
verify-proof (starknet_with_keccak)	52s
Test no_std support (starknet_with_keccak)	4m 3s
Test no_std support (starknet_with_keccak)	3m 50s
	1h 1m 39s

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