pvf: ensure enough stack space (#5712)

* pvf: ensure enough stack space

* fix typos

Co-authored-by: Andronik <write@reusable.software>

* Use rayon to cache the thread

Co-authored-by: Andronik <write@reusable.software>

polkadot/Cargo.lock

@@ -1348,12 +1348,12 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.5"
+version = "0.8.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d82cfc11ce7f2c3faef78d8a684447b40d503d9681acebed6cb728d45940c4db"
+checksum = "8ff1f980957787286a554052d03c7aee98d99cc32e09f6d45f0a814133c87978"
 dependencies = [
  "cfg-if 1.0.0",
- "lazy_static",
+ "once_cell",
 ]
 
 [[package]]
@@ -6768,6 +6768,7 @@ dependencies = [
  "polkadot-node-subsystem-util",
  "polkadot-parachain",
  "rand 0.8.5",
+ "rayon",
  "sc-executor",
  "sc-executor-common",
  "sc-executor-wasmtime",