Implemented add, mult, inv, sub, div, pow and neg for binary fields and wrote tests for each function #3110

Job	Run time
Check no_std	40s
Check (stable)	8s
Check (nightly)	1m 6s
List directories for parallelizing tests	3s
Check Documentation	1m 6s
Check Style	15s
Test (stable)	9m 15s
Test assembly	8m 21s
Test (nightly)	17m 32s
Test (cp6_782/)	14s
Test (mnt4_753/)	12m 13s
Test (mnt6_753/)	25m 44s
Test (./ed_on_mnt4_753)	3m 56s
Test (./secp256r1)	1m 13s
Test (./ed_on_mnt4_298)	1m 18s
Test (./ed_on_cp6_782)	1m 34s
Test (./mnt4_298)	3m 58s
Test (./mnt6_298)	5m 31s
Test (./ed_on_bn254)	1m 2s
Test (./bn254)	2m 44s
Test (./secp256k1)	1m 12s
Test (./bw6_761)	4m 7s
Test (./bls12_377)	4m 37s
Test (./grumpkin)	1m 23s
Test (./secp384r1)	1m 30s
Test (./ed_on_bls12_377)	1m 15s
Test (./secq256k1)	1m 3s
Test (./ed25519)	1m 28s
Test (./ed_on_bls12_381)	1m 27s
Test (./ed_on_bw6_761)	39s
Test (./curve25519)	1m 14s
Test (./ed_on_bls12_381_bandersnatch)	1m 16s
Test (./pallas)	1m 24s
Test (./vesta)	1m 10s
Test (./bw6_767)	4m 37s
Test (./bls12_381)	3m 20s
	2h 9m 35s

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