wasmtime: Add criterion micro benchmarks for traps (#4398)

* wasmtime: Rename host->wasm trampolines

As we introduce new types of trampolines, having clear names for our existing
trampolines will be helpful.

* Fix typo in docs for `VMCOMPONENT_MAGIC`

* wasmtime: Add criterion micro benchmarks for traps

Cargo.toml

@@ -138,6 +138,10 @@ harness = false
 name = "thread_eager_init"
 harness = false
 
+[[bench]]
+name = "trap"
+harness = false
+
 [[bench]]
 name = "call"
 harness = false