Implement serialization and deserialization for `usize` type #887

Job	Run time
rustfmt	12s
Test Rust stable on ubuntu	1m 59s
Clippy	22s
Test Rust nightly on ubuntu	1m 14s
Check with --all-features	30s
Check with --no-default-features	23s
no-std (stable, wasm32-unknown-unknown)	7s
no-std (nightly, wasm32-unknown-unknown)	16s
	5m 3s

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