feat: add support for require_approval argument when creating response

Signed-off-by: Gordon Sim <gsim@redhat.com>

docs/static/llama-stack-spec.yaml

@@ -6254,6 +6254,8 @@ components:
         - $ref: '#/components/schemas/OpenAIResponseOutputMessageFileSearchToolCall'
         - $ref: '#/components/schemas/OpenAIResponseOutputMessageFunctionToolCall'
         - $ref: '#/components/schemas/OpenAIResponseInputFunctionToolCallOutput'
+        - $ref: '#/components/schemas/OpenAIResponseMCPApprovalRequest'
+        - $ref: '#/components/schemas/OpenAIResponseMCPApprovalResponse'
         - $ref: '#/components/schemas/OpenAIResponseMessage'
     "OpenAIResponseInputFunctionToolCallOutput":
       type: object
@@ -6548,6 +6550,53 @@ components:
       title: OpenAIResponseInputToolWebSearch
       description: >-
         Web search tool configuration for OpenAI response inputs.
+    OpenAIResponseMCPApprovalRequest:
+      type: object
+      properties:
+        arguments:
+          type: string
+        id:
+          type: string
+        name:
+          type: string
+        server_label:
+          type: string
+        type:
+          type: string
+          const: mcp_approval_request
+          default: mcp_approval_request
+      additionalProperties: false
+      required:
+        - arguments
+        - id
+        - name
+        - server_label
+        - type
+      title: OpenAIResponseMCPApprovalRequest
+      description: >-
+        A request for human approval of a tool invocation.
+    OpenAIResponseMCPApprovalResponse:
+      type: object
+      properties:
+        approval_request_id:
+          type: string
+        approve:
+          type: boolean
+        type:
+          type: string
+          const: mcp_approval_response
+          default: mcp_approval_response
+        id:
+          type: string
+        reason:
+          type: string
+      additionalProperties: false
+      required:
+        - approval_request_id
+        - approve
+        - type
+      title: OpenAIResponseMCPApprovalResponse
+      description: A response to an MCP approval request.
     OpenAIResponseMessage:
       type: object
       properties:
@@ -6944,6 +6993,7 @@ components:
         - $ref: '#/components/schemas/OpenAIResponseOutputMessageFunctionToolCall'
         - $ref: '#/components/schemas/OpenAIResponseOutputMessageMCPCall'
         - $ref: '#/components/schemas/OpenAIResponseOutputMessageMCPListTools'
+        - $ref: '#/components/schemas/OpenAIResponseMCPApprovalRequest'
       discriminator:
         propertyName: type
         mapping:
@@ -6953,6 +7003,7 @@ components:
           function_call: '#/components/schemas/OpenAIResponseOutputMessageFunctionToolCall'
           mcp_call: '#/components/schemas/OpenAIResponseOutputMessageMCPCall'
           mcp_list_tools: '#/components/schemas/OpenAIResponseOutputMessageMCPListTools'
+          mcp_approval_request: '#/components/schemas/OpenAIResponseMCPApprovalRequest'
     OpenAIResponseOutputMessageMCPCall:
       type: object
       properties: