Add serde::serialize and serde::deserialize traits to signature types #1518

Job	Run time
Ensure consistency between wat and wasm files	10s
smart-contracts/wasm-transform lint:clippy	3m 42s
smart-contracts/wasm-transform lint:fmt	3m 58s
smart-contracts/wasm-chain-integration lint:fmt	3m 57s
smart-contracts/wasm-transform lint:fmt	13s
smart-contracts/wasm-chain-integration lint:fmt	13s
escrow lint:fmt	14s
lockup lint:fmt	12s
use-all-host-functions lint:fmt	11s
wasm-transform cargo:test	3m 47s
wasm-chain-integration cargo:test	17m 41s
rate-limited lint:fmt	11s
counter lint:fmt	12s
counter cargo:test	3m 33s
context-test lint:fmt	14s
smart-contracts/escrow lint:clippy	3m 31s
fib lint:fmt	11s
smart-contracts/lockup lint:clippy	3m 29s
smart-contracts/use-all-host-functions lint:clippy	3m 29s
smart-contracts/wasm-chain-integration lint:clippy	3m 58s
wasm-core-spec cargo:test	4m 1s
smart-contracts/rate-limited lint:clippy	3m 26s
smart-contracts/wasm-chain-integration lint:clippy	4m 37s
smart-contracts/counter lint:clippy	3m 29s
smart-contracts/wasm-chain-integration lint:clippy	4m 14s
smart-contracts/context-test lint:clippy	3m 30s
smart-contracts/fib lint:clippy	3m 51s
	1h 20m 14s

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