[Inference] Overrides snippets inputs (#1613)

So we can call

```js
snippets.getInferenceSnippets(model, "auto", undefined, {
   inputs: `"A dog with a baseball cap"`
});
```

to get the following sample
```python
# output is a PIL.Image object
image = client.text_to_image(
    "A dog with a baseball cap",
    model="black-forest-labs/FLUX.1-dev",
)
```

instead of the default input in the snippet:
```python
image = client.text_to_image(
    "Astronaut riding a horse",
    model="black-forest-labs/FLUX.1-dev",
)
```

it's already possible to do it for `text-generation` with `opts.mesages`

needed for (internal
huggingface-internal/moon-landing#14421)

Author: krampstudio

packages/inference/src/snippets/getInferenceSnippets.ts

@@ -20,6 +20,7 @@ export type InferenceSnippetOptions = {
 	accessToken?: string;
 	directRequest?: boolean; // to bypass HF routing and call the provider directly
 	endpointUrl?: string; // to call a local endpoint directly
+	inputs?: Record<string, unknown>; // overrides the default snippet's inputs
 } & Record<string, unknown>;
 
 const PYTHON_CLIENTS = ["huggingface_hub", "fal_client", "requests", "openai"] as const;
@@ -167,7 +168,11 @@ const snippetGenerator = (templateName: string, inputPreparationFn?: InputPrepar
 		const accessTokenOrPlaceholder = opts?.accessToken ?? placeholder;
 
 		/// Prepare inputs + make request
-		const inputs = inputPreparationFn ? inputPreparationFn(model, opts) : { inputs: getModelInputSnippet(model) };
+		const inputs = opts?.inputs
+			? { inputs: opts.inputs }
+			: inputPreparationFn
+			  ? inputPreparationFn(model, opts)
+			  : { inputs: getModelInputSnippet(model) };
 		const request = makeRequestOptionsFromResolvedModel(
 			providerModelId,
 			providerHelper,