Update pipelines.js to allow for token_embeddings as well (#770)

* Update pipelines.js to allow for `token_embeddings` as well

In recent examples of optimum pipeline export the feature extraction pipelines have their output state as `token_embeddings` instead of `last_hidden_state`.

So we should support this as well.

* Keep diff small

* Keep diff small

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Co-authored-by: Joshua Lochner <admin@xenova.com>

src/pipelines.js

@@ -1255,7 +1255,7 @@ export class FeatureExtractionPipeline extends (/** @type {new (options: TextPip
         // console.log(outputs)
 
         /** @type {Tensor} */
-        let result = outputs.last_hidden_state ?? outputs.logits;
+        let result = outputs.last_hidden_state ?? outputs.logits ?? outputs.token_embeddings;
         if (pooling === 'none') {
             // Skip pooling
         } else if (pooling === 'mean') {