Support for more backends #2815

Job	Run time
Check no_std	35s
Check (stable)	10s
Check (nightly)	41s
List directories for parallelizing tests	2s
Check Documentation	51s
Check Style	8s
Test (stable)	40s
Test (nightly)	34s
Test assembly	8m 31s
Test (cp6_782/)	6s
Test (mnt4_753/)	21m 29s
Test (mnt6_753/)	14s
Test (./secp384r1)	1m 18s
Test (./mnt4_298)	4m 4s
Test (./secp256r1)	1m 2s
Test (./ed25519)	56s
Test (./ed_on_cp6_782)	1m 17s
Test (./bls12_381)	3m 17s
Test (./vesta)	1m 24s
Test (./ed_on_mnt4_298)	1m 3s
Test (./secp256k1)	1m 23s
Test (./ed_on_mnt4_753)	3m 50s
Test (./ed_on_bls12_381)	1m 23s
Test (./pallas)	1m 17s
Test (./bw6_761)	3m 59s
Test (./mnt6_298)	5m 27s
Test (./ed_on_bls12_377)	1m 3s
Test (./bw6_767)	3m 56s
Test (./ed_on_bn254)	1m 11s
Test (./curve25519)	1m 1s
Test (./ed_on_bls12_381_bandersnatch)	1m 18s
Test (./bn254)	2m 18s
Test (./bls12_377)	4m 19s
Test (./secq256k1)	58s
Test (./ed_on_bw6_761)	36s
Test (./grumpkin)	1m 9s
	1h 23m 30s

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