fix(types): make assistant message name optional

- Mark the assistant message `name` field as `NotRequired[Optional[str]]`
to match the optional nature of assistant message metadata and avoid
requiring callers to provide `name` in typed chat completion requests.

Signed-off-by: JamePeng <jame_peng@sina.com>

Author: JamePeng

llama_cpp/llama_types.py

@@ -427,7 +427,7 @@ class ChatCompletionRequestAssistantMessageFunctionCall(TypedDict):
 class ChatCompletionRequestAssistantMessage(TypedDict):
     """Messages sent by the model in response to user messages."""
     role: Literal["assistant"]
-    name: Optional[str]
+    name: NotRequired[Optional[str]]
     content: NotRequired[Optional[str]]
     refusal: NotRequired[Optional[str]]
     tool_calls: NotRequired[ChatCompletionMessageToolCalls]