Several smaller fixes to make adapters work

Also, reorganized the pattern of __init__ inside providers so
configuration can stay lightweight

llama_toolchain/inference/adapters/ollama/__init__.py

@@ -4,4 +4,12 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-from .ollama import get_provider_impl  # noqa
+from llama_toolchain.distribution.datatypes import RemoteProviderConfig
+
+
+async def get_adapter_impl(config: RemoteProviderConfig, _deps):
+    from .ollama import OllamaInferenceAdapter
+
+    impl = OllamaInferenceAdapter(config.url)
+    await impl.initialize()
+    return impl