“Extract module to file” does not work

If I run `LSP: Code Action` on `mod foo` part of the following Rust file:

```rust
mod foo {}
```

The `Extract module to file` action is offered.

But when I invoke it, nothing happens and I see the following in the status bar:

```
Failed to apply code action: Client does not support create capability. (-32803)
```



ST: 4168
LSP: 1.28.0
LSP-r-a: 1.9.1