Expose the ability to get the path of a sidecar binary at runtime

### Describe the problem

In my case, I have 2 binaries that I need to include as sidecars (with the platform triple). One of these binaries depends on the other and needs the path to the binary passed in through the environment, but today there is no way to get the path to a sidecar binary at runtime.

### Describe the solution you'd like

I would like to be able to do something like so:

```javascript
let sidecarOne = Command.sidecar("program-one", ...);
let sidecarOnePath = sidecarOne.getPath();

let sidecarTwo = Command.sidecar("program-two", [...args], { env: { PROGRAM_ONE_PATH: sidecarOnePath } });
```

### Alternatives considered

_No response_

### Additional context

_No response_