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

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

* Fix benchmark compilation

* Fix `cargo fmt`

* Fix compilation of another benchmark I've missed

* Cleanups according to review comments

* Move `max_memory_size` to `Semantics`

* Set `memory_guaranteed_dense_image_size` to `max_memory_size`

* Rename `wasm_instantiation_strategy` to `wasmtime_instantiation_strategy`

* Update the doc-comments regarding the instantiation strategy

* Extend the integration tests to test every instantiation strategy

* Don't drop the temporary directory until the runtime is dropped in benchmarks

* Don't drop the temporary directory until the runtime is dropped in tests

substrate/bin/node/cli/benches/block_production.rs

@@ -29,7 +29,7 @@ use sc_consensus::{
 use sc_service::{
 	config::{
 		DatabaseSource, KeepBlocks, KeystoreConfig, NetworkConfiguration, OffchainWorkerConfig,
-		PruningMode, WasmExecutionMethod,
+		PruningMode, WasmExecutionMethod, WasmtimeInstantiationStrategy,
 	},
 	BasePath, Configuration, Role,
 };
@@ -77,7 +77,9 @@ fn new_node(tokio_handle: Handle) -> node_cli::service::NewFullBase {
 		state_pruning: Some(PruningMode::ArchiveAll),
 		keep_blocks: KeepBlocks::All,
 		chain_spec: spec,
-		wasm_method: WasmExecutionMethod::Compiled,
+		wasm_method: WasmExecutionMethod::Compiled {
+			instantiation_strategy: WasmtimeInstantiationStrategy::PoolingCopyOnWrite,
+		},
 		execution_strategies: ExecutionStrategies {
 			syncing: execution_strategy,
 			importing: execution_strategy,