Update wasmtime to 0.27 (#8913)

* Update wasmtime to 0.27

A couple of notes:

- Now we are fair about unsafeness of runtime creation via an compiled artifact.
  This change was prompted by the change in wasmtime which made
  `deserialize` rightfully unsafe. Now `CodeSupplyMode` was hidden and
  the `create_runtime` now takes the blob again and there is now a new
  fn for creating a runtime with a compiled artifact.
- This is a big change for wasmtime. They switched to the modern backend
  for code generation. While this can bring performance improvements, it
  can also introduce some problems. In fact, 0.27 fixed a serious issue
  that could lead to sandbox escape. Hence we need a proper burn in.

This would require a change to PVF validation host as well.

* Filter regalloc logging

substrate/client/executor/wasmtime/src/lib.rs

@@ -24,4 +24,6 @@ mod runtime;
 mod state_holder;
 mod util;
 
-pub use runtime::{create_runtime, prepare_runtime_artifact, CodeSupplyMode, Config, Semantics};
+pub use runtime::{
+	create_runtime, create_runtime_from_artifact, prepare_runtime_artifact, Config, Semantics,
+};