Folder restructure for evals/datasets/scoring (#419)

* rename evals related stuff

* fix datasetio

* fix scoring test

* localfs -> LocalFS

* refactor scoring

* refactor scoring

* remove 8b_correctness scoring_fn from tests

* tests w/ eval params

* scoring fn braintrust fixture

* import

llama_stack/providers/inline/datasetio/localfs/__init__.py

@@ -0,0 +1,18 @@
+# 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 LocalFSDatasetIOConfig
+
+
+async def get_provider_impl(
+    config: LocalFSDatasetIOConfig,
+    _deps,
+):
+    from .datasetio import LocalFSDatasetIOImpl
+
+    impl = LocalFSDatasetIOImpl(config)
+    await impl.initialize()
+    return impl