Add `in_place` suffix for `BigInteger` methods #2720

Job	Run time
List directories for parallelizing tests	12s
Check no_std	1m 15s
Check (stable)	19s
Check (nightly)	1m 15s
Check Documentation	54s
Check Style	17s
Test assembly	8m 42s
Test (stable)	9m 42s
Test (cp6_782/)	9s
Test (nightly)	18m 5s
Test (mnt4_753/)	14s
Test (mnt6_753/)	18s
Test (./bls12_377)	4m 43s
Test (./ed_on_bn254)	1m 1s
Test (./bw6_761)	3m 57s
Test (./ed_on_bls12_377)	1m 47s
Test (./secp256r1)	1m 6s
Test (./bn254)	2m 31s
Test (./secq256k1)	1m 7s
Test (./mnt6_298)	5m 46s
Test (./secp256k1)	1m 1s
Test (./curve25519)	1m 6s
Test (./ed_on_cp6_782)	1m 42s
Test (./grumpkin)	1m 16s
Test (./ed_on_mnt4_753)	3m 50s
Test (./pallas)	1m 39s
Test (./ed25519)	1m 22s
Test (./vesta)	1m 13s
Test (./ed_on_bls12_381)	1m 36s
Test (./ed_on_mnt4_298)	1m 36s
Test (./secp384r1)	1m 18s
Test (./ed_on_bw6_761)	51s
Test (./bw6_767)	4m 0s
Test (./bls12_381)	3m 19s
Test (./ed_on_bls12_381_bandersnatch)	1m 12s
Test (./mnt4_298)	4m 13s
	1h 34m 34s

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