Implement serialization/deserialization for `Operation` #4922

Job	Run time
Clippy	1m 23s
no-std (stable, wasm32-unknown-unknown)	1m 41s
rustfmt	24s
no-std (nightly, wasm32-unknown-unknown)	1m 31s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 16s
Check Rust stable on ubuntu with --all-targets	1m 11s
Test Rust stable on ubuntu with --profile test-release	9m 15s
Test Rust nightly on windows-2022	0s
Check Rust stable on ubuntu with --all-targets --all-features	1m 16s
Test Rust stable on ubuntu with --profile test-release --doc	6m 19s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 14s
Test Rust nightly on ubuntu with --profile test-release	10m 9s
Check Rust nightly on ubuntu with --all-targets	1m 20s
Test Rust nightly on ubuntu with --profile test-release --doc	6m 27s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 18s
	44m 44s

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