feat: support thought_signature

according to gemini docs: https://ai.google.dev/gemini-api/docs/thought-signatures

thought_signature lives in the extra_content of the tool_call, add extra_content to OpenAIChatCompletionToolCall to support this

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

client-sdks/stainless/openapi.yml

@@ -4228,6 +4228,11 @@ components:
             title: OpenAIChatCompletionToolCallFunction
           - type: 'null'
           title: OpenAIChatCompletionToolCallFunction
+        extra_content:
+          anyOf:
+          - additionalProperties: true
+            type: object
+          - type: 'null'
       type: object
       title: OpenAIChatCompletionToolCall
       description: Tool call specification for OpenAI-compatible chat completion responses.

docs/static/deprecated-llama-stack-spec.yaml

@@ -1071,6 +1071,11 @@ components:
             title: OpenAIChatCompletionToolCallFunction
           - type: 'null'
           title: OpenAIChatCompletionToolCallFunction
+        extra_content:
+          anyOf:
+          - additionalProperties: true
+            type: object
+          - type: 'null'
       type: object
       title: OpenAIChatCompletionToolCall
       description: Tool call specification for OpenAI-compatible chat completion responses.

docs/static/experimental-llama-stack-spec.yaml

@@ -936,6 +936,11 @@ components:
             title: OpenAIChatCompletionToolCallFunction
           - type: 'null'
           title: OpenAIChatCompletionToolCallFunction
+        extra_content:
+          anyOf:
+          - additionalProperties: true
+            type: object
+          - type: 'null'
       type: object
       title: OpenAIChatCompletionToolCall
       description: Tool call specification for OpenAI-compatible chat completion responses.

docs/static/llama-stack-spec.yaml

@@ -3249,6 +3249,11 @@ components:
             title: OpenAIChatCompletionToolCallFunction
           - type: 'null'
           title: OpenAIChatCompletionToolCallFunction
+        extra_content:
+          anyOf:
+          - additionalProperties: true
+            type: object
+          - type: 'null'
       type: object
       title: OpenAIChatCompletionToolCall
       description: Tool call specification for OpenAI-compatible chat completion responses.

docs/static/stainless-llama-stack-spec.yaml

@@ -4228,6 +4228,11 @@ components:
             title: OpenAIChatCompletionToolCallFunction
           - type: 'null'
           title: OpenAIChatCompletionToolCallFunction
+        extra_content:
+          anyOf:
+          - additionalProperties: true
+            type: object
+          - type: 'null'
       type: object
       title: OpenAIChatCompletionToolCall
       description: Tool call specification for OpenAI-compatible chat completion responses.

src/llama_stack_api/inference.py

@@ -438,6 +438,7 @@ class OpenAIChatCompletionToolCall(BaseModel):
     id: str | None = None
     type: Literal["function"] = "function"
     function: OpenAIChatCompletionToolCallFunction | None = None
+    extra_content: dict[str, Any] | None = None
 
 
 @json_schema_type