Switch to pooling copy-on-write instantiation strategy for WASM (companion for Substrate#11232) (#5337)

* Switch to pooling copy-on-write instantiation strategy for WASM

* Fix compilation of `polkadot-test-service`

* Update comments

* Move `max_memory_size` to `Semantics`

* Rename `WasmInstantiationStrategy` to `WasmtimeInstantiationStrategy`

* Update a safety comment

* update lockfile for {"substrate"}

Co-authored-by: parity-processbot <>

polkadot/node/core/pvf/src/artifacts.rs

@@ -17,15 +17,12 @@
 use crate::{error::PrepareError, host::PrepareResultSender};
 use always_assert::always;
 use async_std::path::{Path, PathBuf};
-use parity_scale_codec::{Decode, Encode};
 use polkadot_parachain::primitives::ValidationCodeHash;
 use std::{
 	collections::HashMap,
 	time::{Duration, SystemTime},
 };
 
-/// A wrapper for the compiled PVF code.
-#[derive(Encode, Decode)]
 pub struct CompiledArtifact(Vec<u8>);
 
 impl CompiledArtifact {