Implemented add, mult, inv, sub, div, pow and neg for binary fields and wrote tests for each function #3109

Job	Run time
Check no_std	27s
Check (stable)	1m 9s
Check (nightly)	1m 6s
List directories for parallelizing tests	2s
Check Documentation	59s
Check Style	18s
Test (stable)	9m 9s
Test (nightly)	17m 34s
Test assembly	8m 22s
Test (cp6_782/)	28m 47s
Test (mnt4_753/)	15m 15s
Test (mnt6_753/)	28m 38s
Test (./ed_on_mnt4_753)	3m 52s
Test (./secp256r1)	1m 13s
Test (./ed_on_mnt4_298)	1m 20s
Test (./ed_on_cp6_782)	1m 21s
Test (./mnt4_298)	3m 59s
Test (./mnt6_298)	5m 34s
Test (./ed_on_bn254)	1m 15s
Test (./bn254)	2m 18s
Test (./secp256k1)	1m 12s
Test (./bw6_761)	4m 5s
Test (./bls12_377)	4m 17s
Test (./grumpkin)	1m 19s
Test (./secp384r1)	1m 46s
Test (./ed_on_bls12_377)	1m 18s
Test (./secq256k1)	1m 5s
Test (./ed25519)	1m 35s
Test (./ed_on_bls12_381)	1m 36s
Test (./ed_on_bw6_761)	57s
Test (./curve25519)	1m 20s
Test (./ed_on_bls12_381_bandersnatch)	1m 8s
Test (./pallas)	1m 26s
Test (./vesta)	1m 13s
Test (./bw6_767)	4m 8s
Test (./bls12_381)	3m 24s
	2h 44m 27s

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