feat: implement provider updating

add `v1/providers/` which uses PUT to allow users to change their provider configuration

this is a follow up to #1429 and related to #1359

a user can call something like:

`llama_stack_client.providers.update(api="inference", provider_id="ollama", provider_type="remote::ollama", config={'url': 'http:/localhost:12345'})`

or

`llama-stack-client providers update inference ollama remote::ollama "{'url': 'http://localhost:12345'}"`

this API works by adding a `RequestMiddleware` to the server which checks requests, and if the user is using PUT /v1/providers, the routes are re-registered with the re-initialized provider configurations/methods

for the client, `self.impls` is updated to hold the proper methods+configurations

this depends on a client PR, the CI will fail until then but succeeded locally

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

llama_stack/distribution/library_client.py

@@ -25,6 +25,7 @@ from llama_stack_client import (
     AsyncStream,
     LlamaStackClient,
 )
+from llama_stack_client.types import provider_info
 from pydantic import BaseModel, TypeAdapter
 from rich.console import Console
 from termcolor import cprint
@@ -293,6 +294,22 @@ class AsyncLlamaStackAsLibraryClient(AsyncLlamaStackClient):
                     cast_to=cast_to,
                     options=options,
                 )
+            # Check if response is of a certain type
+            # this indicates we have done a provider update
+            if (
+                isinstance(response, provider_info.ProviderInfo)
+                and hasattr(response, "config")
+                and options.method.lower() == "put"
+            ):
+                # patch in the new provider config
+                for api, providers in self.config.providers.items():
+                    if api != response.api:
+                        continue
+                    for prov in providers:
+                        if prov.provider_id == response.provider_id:
+                            prov.config = response.config
+                            break
+                await self.initialize()
             return response
 
     async def _call_non_streaming(