Implemented add, mult, inv, sub, div, pow and neg for binary fields and wrote tests for each function #2962

Job	Run time
Check (stable)	2m 30s
Check Documentation	59s
Check (nightly)	1m 17s
Check no_std	34s
List directories for parallelizing tests	2s
Check Style	12s
Test (stable)	9m 1s
Test (nightly)	17m 40s
Test (cp6_782/)	28m 49s
Test assembly	8m 23s
Test (mnt4_753/)	14m 24s
Test (mnt6_753/)	27m 38s
Test (./ed_on_mnt4_753)	3m 59s
Test (./secp256r1)	54s
Test (./ed_on_mnt4_298)	1m 9s
Test (./ed_on_cp6_782)	1m 23s
Test (./mnt4_298)	3m 48s
Test (./mnt6_298)	5m 40s
Test (./ed_on_bn254)	1m 3s
Test (./bn254)	2m 18s
Test (./secp256k1)	1m 4s
Test (./bw6_761)	4m 4s
Test (./bls12_377)	4m 7s
Test (./grumpkin)	1m 10s
Test (./secp384r1)	1m 22s
Test (./ed_on_bls12_377)	1m 10s
Test (./secq256k1)	56s
Test (./ed25519)	54s
Test (./ed_on_bls12_381)	1m 14s
Test (./ed_on_bw6_761)	45s
Test (./curve25519)	1m 11s
Test (./ed_on_bls12_381_bandersnatch)	1m 2s
Test (./pallas)	1m 11s
Test (./vesta)	1m 4s
Test (./bw6_767)	3m 58s
Test (./bls12_381)	3m 17s
	2h 40m 12s

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