feat: add function to decode an entire slice #74

Job	Run time
feature checks	15s
clippy	17s
fmt	11s
docs	17s
check WASM	9s
test stable --no-default-features	10s
test stable	13s
test stable --all-features	8s
test beta --no-default-features	15s
test beta	16s
test beta --all-features	16s
test nightly --no-default-features	14s
test nightly	14s
test nightly --all-features	14s
test 1.64 --no-default-features	20s
test 1.64	21s
test 1.64 --all-features	23s
	4m 13s

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