internal/cm: update to go.bytecodealliance.org/cm@v0.2.0

src/internal/cm/stream.go

@@ -0,0 +1,15 @@
+package cm
+
+// Stream represents the Component Model [stream] type.
+// A stream is a special case of stream. In non-error cases,
+// a stream delivers exactly one value before being automatically closed.
+//
+// [stream]: https://github.com/WebAssembly/component-model/blob/main/design/mvp/Explainer.md#asynchronous-value-types
+type Stream[T any] struct {
+	_ HostLayout
+	stream[T]
+}
+
+type stream[T any] uint32
+
+// TODO: implement methods on type stream