Add GLV for simple curves: BW6-767, Grumpkin, secp256k1, secq256k1 #2722

Job	Run time
Check Documentation	55s
Check Style	9s
Test (stable)	9m 10s
Test (nightly)	18m 0s
Check (stable)	8s
Check (nightly)	1m 12s
Check no_std	25s
List directories for parallelizing tests	2s
Test assembly	8m 19s
Test (cp6_782/)	5s
Test (mnt4_753/)	13s
Test (mnt6_753/)	33m 36s
Test (./bls12_377)	4m 22s
Test (./ed_on_bn254)	58s
Test (./bw6_761)	4m 0s
Test (./ed_on_bls12_377)	1m 4s
Test (./secp256r1)	56s
Test (./bn254)	2m 19s
Test (./secq256k1)	55s
Test (./mnt6_298)	5m 36s
Test (./secp256k1)	1m 0s
Test (./curve25519)	59s
Test (./ed_on_cp6_782)	1m 14s
Test (./grumpkin)	1m 17s
Test (./ed_on_mnt4_753)	3m 43s
Test (./pallas)	1m 5s
Test (./ed25519)	51s
Test (./vesta)	1m 8s
Test (./ed_on_bls12_381)	1m 13s
Test (./ed_on_mnt4_298)	1m 4s
Test (./secp384r1)	1m 19s
Test (./ed_on_bw6_761)	50s
Test (./bw6_767)	3m 57s
Test (./bls12_381)	3m 15s
Test (./ed_on_bls12_381_bandersnatch)	1m 2s
Test (./mnt4_298)	3m 54s
	2h 0m 15s

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