Make LlamaStackLibraryClient work correctly (#581)

This PR does a few things:

- it moves "direct client" to llama-stack repo instead of being in the
llama-stack-client-python repo
- renames it to `LlamaStackLibraryClient`
- actually makes synchronous generators work 
- makes streaming and non-streaming work properly

In many ways, this PR makes things finally "work"

## Test Plan

See a `library_client_test.py` I added. This isn't really quite a test
yet but it demonstrates that this mode now works. Here's the invocation
and the response:

```
INFERENCE_MODEL=meta-llama/Llama-3.2-3B-Instruct python llama_stack/distribution/tests/library_client_test.py ollama
```


![image](https://github.com/user-attachments/assets/17d4e116-4457-4755-a14e-d9a668801fe0)

llama_stack/distribution/build.py

@@ -46,7 +46,7 @@ class ApiInput(BaseModel):
 
 
 def get_provider_dependencies(
-    config_providers: Dict[str, List[Provider]]
+    config_providers: Dict[str, List[Provider]],
 ) -> tuple[list[str], list[str]]:
     """Get normal and special dependencies from provider configuration."""
     all_providers = get_provider_registry()
@@ -92,11 +92,11 @@ def print_pip_install_help(providers: Dict[str, List[Provider]]):
     normal_deps, special_deps = get_provider_dependencies(providers)
 
     cprint(
-        f"Please install needed dependencies using the following commands:\n\n\tpip install {' '.join(normal_deps)}",
+        f"Please install needed dependencies using the following commands:\n\npip install {' '.join(normal_deps)}",
         "yellow",
     )
     for special_dep in special_deps:
-        cprint(f"\tpip install {special_dep}", "yellow")
+        cprint(f"pip install {special_dep}", "yellow")
     print()