feat: Build rv64 target library in SP1 toolchain

[wakabat]

For older toolchains, this might fail since it requires rv64 zkvm target. So we might want to put this on hold for now.

[github-actions]

Test	Old	New	Diff
k256_test_verify_rand_lte_100	24190036	24203071	0.0539 %
p256_test_recover_rand_lte_100	6708147	6695093	-0.1946 %
rustcrypto_bigint_test_bigint_mul_add_residue	2234083	2234083	0.0000 %
curve25519_dalek_ng_test_zero_msm	217069	217069	0.0000 %
k256_test_recover_pubkey_infinity	123304	123304	0.0000 %
rust_crypto_rsa_test_pkcs_verify_100	101521882	102353153	0.8188 %
secp256k1_program_test_recover_rand_lte_100	6339711	6361245	0.3397 %
bls12_381_tests_test_bls_add_100	15803389	15803389	0.0000 %
keccack_test_expected_digest_lte_100	2035001	2035029	0.0014 %
bls12_381_tests_test_sqrt_fp2_100	1983864	2186322	10.2052 %
secp256k1_program_test_verify_v0_30_0_rand_lte_100	46793443	46806823	0.0286 %
secp256k1_program_test_verify_rand_lte_100	46815090	46683204	-0.2817 %
bn_test_bn_test_g1_double_100	657906	657906	0.0000 %
bls12_381_tests_test_mul_fp2_100	3214299	3214299	0.0000 %
bn_test_bn_test_fq_inverse_100	761187	761187	0.0000 %
sha_test_sha2_v0_10_8_expected_digest_lte_100_times	1485857	1484216	-0.1104 %
bls12_381_tests_test_inverse_fp_100	1645387	1645387	0.0000 %
bls12_381_tests_test_sqrt_fp_100	1075509	985909	-8.3309 %
bn_test_bn_test_fq_sqrt_100	756487	756487	0.0000 %
sha_test_sha2_v0_9_9_expected_digest_lte_100_times	1450668	1450325	-0.0236 %
curve25519_dalek_test_zero_msm	213517	213517	0.0000 %
bls12_381_tests_test_add_fp_100	1625514	1625514	0.0000 %
curve25519_dalek_test_zero_mul	197407	197407	0.0000 %
bn_test_bn_test_g1_add_100	849717	849717	0.0000 %
curve25519_dalek_ng_test_add_then_multiply	7576598	8363686	10.3884 %
curve25519_dalek_ng_test_decompressed_noncanonical	200254	200254	0.0000 %
secp256k1_program_test_recover_v0_30_0_rand_lte_100	6343080	6349630	0.1033 %
bn_test_bn_test_fr_inverse_100	791687	791687	0.0000 %
curve25519_dalek_ng_test_zero_mul	197423	197423	0.0000 %
k256_test_recover_rand_lte_100	5488899	5493522	0.0842 %
k256_test_recover_high_hash_high_recid	2975281	2557373	-14.0460 %
bls12_381_tests_test_mul_fp_100	1310411	1310411	0.0000 %
bls12_381_tests_test_bls_double_100	9242387	9242387	0.0000 %
bls12_381_tests_test_inverse_fp2_100	3079869	3079869	0.0000 %
sha_test_sha2_v0_10_6_expected_digest_lte_100_times	1482598	1484774	0.1468 %
p256_test_verify_rand_lte_100	24745234	24707578	-0.1522 %
sha_test_sha3_expected_digest_lte_100_times	1891246	1891039	-0.0109 %
bls12_381_tests_test_add_fp2_100	3212499	3212499	0.0000 %
curve25519_dalek_test_decompressed_noncanonical	9141	9141	0.0000 %
curve25519_dalek_test_decompressed_expected_value	15995293	16150654	0.9713 %
p256_test_recover_high_hash_high_recid	2930430	3191413	8.9060 %
k256_test_schnorr_verify	6738974	6737105	-0.0277 %
p256_test_recover_pubkey_infinity	129925	129925	0.0000 %
curve25519_dalek_test_add_then_multiply	7791206	6031800	-22.5819 %
rustcrypto_bigint_test_bigint_mul_mod_special	2328641	2328641	0.0000 %
curve25519_dalek_test_ed25519_verify	32352363	32353012	0.0020 %