give sychronous ResourceLimiter an async alternative

Cargo.lock

@@ -108,9 +108,9 @@ dependencies = [
 
 [[package]]
 name = "async-trait"
-version = "0.1.50"
+version = "0.1.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b98e84bbb4cbcdd97da190ba0c58a1bb0de2c1fdf67d159e192ed766aeca722"
+checksum = "44318e776df68115a881de9a8fd1b9e53368d7a4a5ce4cc48517da3393233a5e"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -3362,6 +3362,7 @@ name = "wasmtime"
 version = "0.30.0"
 dependencies = [
  "anyhow",
+ "async-trait",
  "backtrace",
  "bincode",
  "cfg-if 1.0.0",
@@ -3459,6 +3460,7 @@ name = "wasmtime-cli"
 version = "0.30.0"
 dependencies = [
  "anyhow",
+ "async-trait",
  "criterion",
  "env_logger 0.8.3",
  "file-per-thread-logger",