Derive `Clone` for `{map,set}::IntoIter` #394

Job	Run time
miri	4m 45s
Check MSRV and minimal-versions	37s
clippy	19s
tests (1.63.0)	57s
nostd_build (1.63.0, thumbv6m-none-eabi)	22s
tests (stable, arbitrary)	33s
nostd_build (stable, thumbv6m-none-eabi)	15s
tests (stable, quickcheck)	41s
tests (stable, rayon)	46s
tests (stable, rustc-rayon)	40s
tests (stable, serde)	59s
tests (stable, borsh)	33s
tests (stable, std)	31s
tests (beta)	36s
tests (nightly, test build benchmarks)	36s
Success	1s
	13m 11s

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