Enable vision models for (Together, Fireworks, Meta-Reference, Ollama) (#376)

* Enable vision models for Together and Fireworks

* Works with ollama 0.4.0 pre-release with the vision model

* localize media for meta_reference inference

* Fix

llama_stack/providers/tests/inference/utils.py

@@ -0,0 +1,16 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+import itertools
+
+
+def group_chunks(response):
+    return {
+        event_type: list(group)
+        for event_type, group in itertools.groupby(
+            response, key=lambda chunk: chunk.event.event_type
+        )
+    }