feat: add `copy_*e_to_slice` family #971

Job	Run time
Clippy	53s
Docs	48s
Cargo deny check	19s
Feature checks	48s
Fmt	15s
test (stable, --no-default-features)	1m 2s
test (stable)	57s
test (stable, --all-features)	2m 13s
test (beta, --no-default-features)	1m 2s
test (beta)	1m 8s
test (beta, --all-features)	2m 12s
test (nightly, --no-default-features)	53s
test (nightly)	51s
test (nightly, --all-features)	1m 51s
test (1.65, --no-default-features)	20s
test (1.65)	16s
Accept	1s
	15m 49s

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