Add a new host function for reporting fatal errors; make WASM backtraces readable when printing out errors (#10741)

* Add a new host function for reporting fatal errors

* Fix one of the wasmtime executor tests

* Have `#[runtime_interface(wasm_only)]` actually mean WASM-only, and not no_std-only

* Print out errors through `Display` instead of `Debug`

* Switch one more trait to require `Error` for its error instead of only `Debug`

* Align to review comments

substrate/client/executor/src/wasm_runtime.rs

@@ -105,13 +105,13 @@ impl VersionedRuntime {
 					if new_inst {
 						log::warn!(
 							target: "wasm-runtime",
-							"Fresh runtime instance failed with {:?}",
+							"Fresh runtime instance failed with {}",
 							e,
 						)
 					} else {
 						log::warn!(
 							target: "wasm-runtime",
-							"Evicting failed runtime instance: {:?}",
+							"Evicting failed runtime instance: {}",
 							e,
 						);
 					}