Remove `Serializable` and `Deserializable` implementations from slices and vecs #894

Job	Run time
rustfmt	13s
no-std (stable, wasm32-unknown-unknown)	34s
Clippy	26s
no-std (nightly, wasm32-unknown-unknown)	31s
Check with --all-features	27s
Test Rust stable on ubuntu	1m 12s
Check with --no-default-features	26s
Test Rust nightly on ubuntu	1m 12s
	5m 1s

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