feat: add provider API for listing and inspecting provider info

currently the `inspect` API for providers is really a `list` API. Create a new `providers` API which has a GET `providers/{provider_id}` inspect API
which returns "user friendly" configuration to the end user. Also add a GET `/providers` endpoint which returns the list of providers as `inspect/providers` does today.

This API follows CRUD and is more intuitive/RESTful.

This work is part of the RFC at #1359

Signed-off-by: Charlie Doern <cdoern@redhat.com>

tests/integration/providers/__init__.py

@@ -0,0 +1,5 @@
+# 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.

tests/integration/providers/test_providers.py

@@ -0,0 +1,17 @@
+# 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 pytest
+from llama_stack_client import LlamaStackClient
+
+from llama_stack import LlamaStackAsLibraryClient
+
+
+class TestProviders:
+    @pytest.mark.asyncio
+    def test_list(self, llama_stack_client: LlamaStackAsLibraryClient | LlamaStackClient):
+        provider_list = llama_stack_client.providers.list()
+        assert provider_list is not None