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>

docs/_static/llama-stack-spec.yaml

@@ -1782,6 +1782,57 @@ paths:
             schema:
               $ref: '#/components/schemas/RegisterModelRequest'
         required: true
+  /v1/providers:
+    get:
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ListProvidersResponse'
+        '400':
+          $ref: '#/components/responses/BadRequest400'
+        '429':
+          $ref: >-
+            #/components/responses/TooManyRequests429
+        '500':
+          $ref: >-
+            #/components/responses/InternalServerError500
+        default:
+          $ref: '#/components/responses/DefaultError'
+      tags:
+        - Providers
+      description: ''
+      parameters: []
+  /v1/providers/{provider_id}:
+    get:
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/GetProviderResponse'
+        '400':
+          $ref: '#/components/responses/BadRequest400'
+        '429':
+          $ref: >-
+            #/components/responses/TooManyRequests429
+        '500':
+          $ref: >-
+            #/components/responses/InternalServerError500
+        default:
+          $ref: '#/components/responses/DefaultError'
+      tags:
+        - Providers
+      description: ''
+      parameters:
+        - name: provider_id
+          in: path
+          required: true
+          schema:
+            type: string
   /v1/inspect/providers:
     get:
       responses: