add databricks provider (#83)

* add databricks provider

* update provider and test

llama_stack/providers/adapters/inference/databricks/__init__.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.
+
+from .config import DatabricksImplConfig
+from .databricks import DatabricksInferenceAdapter
+
+async def get_adapter_impl(config: DatabricksImplConfig, _deps):
+    assert isinstance(
+        config, DatabricksImplConfig
+    ), f"Unexpected config type: {type(config)}"
+    impl = DatabricksInferenceAdapter(config)
+    await impl.initialize()
+    return impl