wasmtime::component::bindgen: How to specify a resource in "imports:"?

In the documentation [here](https://docs.wasmtime.dev/api/wasmtime/component/macro.bindgen.html) there are examples of imported interfaces, but not of resources in the interfaces.

Specificaly I want to mark only the resource as `async`. I've tried various notations to no avail.

Given this world:

```
package floria:plugins;

world dispatch-plugin {
import floria;
}

interface floria {
resource session {
constructor();
get-entity: func(id: string) -> result;
}
```

Here are my bindings:

```rust
wasmtime::component::bindgen!({
path: "assets/wit/floria-plugins.wit",
imports: {
// "floria:plugins/floria.session": async | trappable,
default: trappable,
}
});
```

The commented-out line is one of my attempts. :) However, I get errors such as this:

```
unused `imports` rules found: ["\"floria:plugins/floria.session\": FunctionFlags(ASYNC | TRAPPABLE)"]
```

What is the correct notation for referring to resources in `imports`? Is it even possible?

Note that I truncated the WIT file here. In fact I have many more imports, which I do *not* want to be `async`.

Start with the wasmtime::component::bindgen documentation and the imports rules shown in the issue, then reproduce the example using assets/wit/floria-plugins.wit. Determine whether resources can be selected independently for async handling, and document the supported notation or limitation with a resource-specific example.

Written by the indexing model from the issue text.