add clippy rules for ff-macros crate #3172

Job	Run time
List directories for parallelizing tests	3s
Check no_std	26s
Check (stable)	8s
Check (nightly)	1m 8s
Check Documentation	1m 2s
Test (stable)	9m 6s
Check Style	7s
Test (nightly)	17m 39s
Test assembly	8m 13s
Test (cp6_782/)	27m 2s
Test (mnt4_753/)	12m 30s
Test (mnt6_753/)	25m 6s
Test (./bls12_381)	3m 11s
Test (./mnt6_298)	4m 50s
Test (./vesta)	1m 38s
Test (./ed_on_bls12_381_bandersnatch)	1m 5s
Test (./secp384r1)	1m 17s
Test (./bw6_767)	3m 47s
Test (./ed_on_bls12_381)	1m 16s
Test (./ed_on_mnt4_298)	1m 31s
Test (./mnt4_298)	3m 41s
Test (./bn254)	2m 14s
Test (./bls12_377)	3m 57s
Test (./secp256r1)	1m 0s
Test (./ed25519)	54s
Test (./bw6_761)	3m 51s
Test (./ed_on_bls12_377)	1m 6s
Test (./pallas)	1m 8s
Test (./ed_on_mnt4_753)	3m 56s
Test (./secp256k1)	1m 3s
Test (./ed_on_bw6_761)	40s
Test (./ed_on_cp6_782)	1m 14s
Test (./ed_on_bn254)	58s
Test (./curve25519)	1m 5s
Test (./secq256k1)	55s
Test (./grumpkin)	1m 7s
	2h 29m 54s

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