[feat] Add option to disable CREATE_NO_WINDOW flag

### Describe the problem

```
export async function openREPL() {
const appDirPath = await appDir();
const command = Command.sidecar("bin/goalc", [
"--startup-cmd",
"(mi)",
"--proj-path",
`${appDirPath}data`,
]);
command.spawn();
}
```
The sidecar app that I'm spawning here, `bin/goalc`, is a console app. When I call this function I can tell that the application is running properly from Task Manager, however the console window does not open on the screen.

### Describe the solution you'd like

I'm not sure what the solution to this is.

### Alternatives considered

```
Command::new("start")
.args(&[*my external bin*, "--option", "args"])
.spawn()
.unwrap();
```
I considered writing functions on the rust side to launch my sidecar app, something along the lines of the code block above. However, I wasn't sure if I would be able to access the external binaries from rust easily. Also, I wanted to avoid multiple implementations for different OS.

### Additional context

_No response_

Start from the sidecar command path used by openREPL and the Rust process-launching code represented by Command::new. Check where the Windows CREATE_NO_WINDOW flag is applied and how sidecar options are exposed across operating systems. Done means callers can disable that flag for console sidecars without requiring separate platform-specific implementations.

Written by the indexing model from the issue text.