Implement serialization/deserialization for `Operation` #4925

Job	Run time
Clippy	1m 13s
rustfmt	19s
no-std (stable, wasm32-unknown-unknown)	1m 32s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 12s
no-std (nightly, wasm32-unknown-unknown)	1m 30s
Test Rust stable on ubuntu with --profile test-release	10m 21s
Check Rust stable on ubuntu with --all-targets	1m 9s
Test Rust nightly on windows-2022	0s
Test Rust stable on ubuntu with --profile test-release --doc	5m 53s
Check Rust stable on ubuntu with --all-targets --all-features	1m 19s
Test Rust nightly on ubuntu with --profile test-release	11m 30s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 12s
Test Rust nightly on ubuntu with --profile test-release --doc	6m 25s
Check Rust nightly on ubuntu with --all-targets	1m 15s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 19s
	46m 9s

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