components: Injection of outer aliases doesn't work for core wasm types

This component

```wasm
(component
(core type $t (func))
(core type (module
(export "" (func (type $t)))
))
)
```

currently yields:

```
$ wasm-tools validate foo.wat --features component-model
Error: failed to find type named `$t`
--> foo.wat:4:28
|
4 | (export "" (func (type $t)))
| ^
```

but I think we should implement automatic injection of aliases.

I initially tried to get this working by modifying [these lines](https://github.com/bytecodealliance/wasm-tools/blob/070859ee09b5e2d82129baf813c6356db5dda169/crates/wast/src/component/resolve.rs#L736-L741) to call `resolver.resolve_ns` which handles outer alias injection but that quickly ran afoul of https://github.com/WebAssembly/component-model/issues/64 where within a module type core outer aliases must be encoded one way but currently they're encoded a different way in `wast`. I didn't want to deal with all the specifics just yet so I decided to file an issue for this to not forget about it instead of finishing the implementation.