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/Cargo.lock

@@ -4173,6 +4173,15 @@ version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
 
+[[package]]
+name = "memfd"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6627dc657574b49d6ad27105ed671822be56e0d2547d413bfbf3e8d8fa92e7a"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "memmap"
 version = "0.7.0"
@@ -8197,6 +8206,7 @@ dependencies = [
  "hex-literal",
  "lazy_static",
  "lru",
+ "num_cpus",
  "parity-scale-codec",
  "parking_lot 0.12.0",
  "paste 1.0.6",
@@ -8221,6 +8231,7 @@ dependencies = [
  "sp-version",
  "sp-wasm-interface",
  "substrate-test-runtime",
+ "tempfile",
  "tracing",
  "tracing-subscriber",
  "wasmi",
@@ -8274,6 +8285,7 @@ dependencies = [
  "sp-runtime-interface",
  "sp-sandbox",
  "sp-wasm-interface",
+ "tempfile",
  "wasmtime",
  "wat",
 ]
@@ -11838,6 +11850,7 @@ dependencies = [
  "libc",
  "log",
  "mach",
+ "memfd",
  "memoffset",
  "more-asserts",
  "rand 0.8.4",