Add provider data passing for library client (#750)

# What does this PR do?

This PR adds the provider data passing for the library client and
changes the provider's api keys be unique


## Test Plan

LLAMA_STACK_CONFIG="/Users/dineshyv/.llama/distributions/llamastack-fireworks/fireworks-run.yaml"
pytest -v tests/client-sdk/agents/test_agents.py

run.yaml:
https://gist.github.com/dineshyv/0c10b5c7d0a2fb7ba4f0ecc8dcf860d1

llama_stack/distribution/library_client.py

@@ -33,6 +33,7 @@ from termcolor import cprint
 from llama_stack.distribution.build import print_pip_install_help
 from llama_stack.distribution.configure import parse_and_maybe_upgrade_config
 from llama_stack.distribution.datatypes import Api
+from llama_stack.distribution.request_headers import set_request_provider_data
 from llama_stack.distribution.resolver import ProviderRegistry
 from llama_stack.distribution.server.endpoints import get_all_api_endpoints
 from llama_stack.distribution.stack import (
@@ -67,6 +68,7 @@ def stream_across_asyncio_run_boundary(
     async_gen_maker,
     pool_executor: ThreadPoolExecutor,
     path: Optional[str] = None,
+    provider_data: Optional[dict[str, Any]] = None,
 ) -> Generator[T, None, None]:
     result_queue = queue.Queue()
     stop_event = threading.Event()
@@ -75,6 +77,10 @@ def stream_across_asyncio_run_boundary(
         # make sure we make the generator in the event loop context
         gen = await async_gen_maker()
         await start_trace(path, {"__location__": "library_client"})
+        if provider_data:
+            set_request_provider_data(
+                {"X-LlamaStack-Provider-Data": json.dumps(provider_data)}
+            )
         try:
             async for item in await gen:
                 result_queue.put(item)
@@ -174,6 +180,7 @@ class LlamaStackAsLibraryClient(LlamaStackClient):
         config_path_or_template_name: str,
         skip_logger_removal: bool = False,
         custom_provider_registry: Optional[ProviderRegistry] = None,
+        provider_data: Optional[dict[str, Any]] = None,
     ):
         super().__init__()
         self.async_client = AsyncLlamaStackAsLibraryClient(
@@ -181,6 +188,7 @@ class LlamaStackAsLibraryClient(LlamaStackClient):
         )
         self.pool_executor = ThreadPoolExecutor(max_workers=4)
         self.skip_logger_removal = skip_logger_removal
+        self.provider_data = provider_data
 
     def initialize(self):
         if in_notebook():
@@ -219,10 +227,15 @@ class LlamaStackAsLibraryClient(LlamaStackClient):
                 lambda: self.async_client.request(*args, **kwargs),
                 self.pool_executor,
                 path=path,
+                provider_data=self.provider_data,
             )
         else:
 
             async def _traced_request():
+                if self.provider_data:
+                    set_request_provider_data(
+                        {"X-LlamaStack-Provider-Data": json.dumps(self.provider_data)}
+                    )
                 await start_trace(path, {"__location__": "library_client"})
                 try:
                     return await self.async_client.request(*args, **kwargs)