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>

llama_stack/distribution/resolver.py

@@ -16,6 +16,7 @@ from llama_stack.apis.inference import Inference
 from llama_stack.apis.inspect import Inspect
 from llama_stack.apis.models import Models
 from llama_stack.apis.post_training import PostTraining
+from llama_stack.apis.providers import Providers as ProvidersAPI
 from llama_stack.apis.safety import Safety
 from llama_stack.apis.scoring import Scoring
 from llama_stack.apis.scoring_functions import ScoringFunctions
@@ -59,6 +60,7 @@ class InvalidProviderError(Exception):
 
 def api_protocol_map() -> Dict[Api, Any]:
     return {
+        Api.providers: ProvidersAPI,
         Api.agents: Agents,
         Api.inference: Inference,
         Api.inspect: Inspect,
@@ -247,6 +249,25 @@ def sort_providers_by_deps(
         )
     )
 
+    sorted_providers.append(
+        (
+            "providers",
+            ProviderWithSpec(
+                provider_id="__builtin__",
+                provider_type="__builtin__",
+                config={"run_config": run_config.model_dump()},
+                spec=InlineProviderSpec(
+                    api=Api.providers,
+                    provider_type="__builtin__",
+                    config_class="llama_stack.distribution.providers.ProviderImplConfig",
+                    module="llama_stack.distribution.providers",
+                    api_dependencies=apis,
+                    deps__=[x.value for x in apis],
+                ),
+            ),
+        )
+    )
+
     logger.debug(f"Resolved {len(sorted_providers)} providers")
     for api_str, provider in sorted_providers:
         logger.debug(f" {api_str} => {provider.provider_id}")