Support for more backends #2757

Job	Run time
Check no_std	41s
Check (stable)	10s
Check (nightly)	23s
List directories for parallelizing tests	4s
Check Documentation	55s
Check Style	13s
Test (stable)	22s
Test assembly	8m 36s
Test (nightly)	21s
Test (cp6_782/)	6s
Test (mnt6_753/)	15s
Test (mnt4_753/)	25m 27s
Test (./bls12_377)	4m 32s
Test (./ed_on_bn254)	56s
Test (./bw6_761)	3m 59s
Test (./ed_on_bls12_377)	1m 9s
Test (./secp256r1)	1m 2s
Test (./bn254)	2m 24s
Test (./secq256k1)	59s
Test (./mnt6_298)	5m 35s
Test (./secp256k1)	1m 6s
Test (./curve25519)	1m 1s
Test (./ed_on_cp6_782)	1m 17s
Test (./grumpkin)	1m 11s
Test (./ed_on_mnt4_753)	3m 50s
Test (./pallas)	1m 8s
Test (./ed25519)	59s
Test (./vesta)	1m 17s
Test (./ed_on_bls12_381)	1m 14s
Test (./ed_on_mnt4_298)	1m 9s
Test (./secp384r1)	1m 28s
Test (./ed_on_bw6_761)	40s
Test (./bw6_767)	3m 58s
Test (./bls12_381)	3m 15s
Test (./ed_on_bls12_381_bandersnatch)	1m 5s
Test (./mnt4_298)	3m 57s
	1h 26m 44s

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