wasm-component generate components for modules with host function imports

Say I have an existing module like this:

```wat
(module
(import "env" "host_function" (func $host_function (result i32)))
(func $call_host_function (result i32) call $host_function)
(export "call_host_function" (func $call_host_function))
)
```

Running the component cli I get:

```sh
wasm-tools component new host_function.wasm -o host_function_component.wasm
error: failed to encode a component from module

Caused by:
0: failed to decode world from module
1: module was not valid
2: module requires an import interface named `env`
```
The vast majority of imports are host functions and are not provided by other modules, in these cases using the type signature of the import it should be possible to generate any worlds/interfaces needed (like env in this case)?