Bug: Set ToolCallBehavior.allowAllKernelFunctions(false) doesn't work for getStreamingChatMessageContentsAsync

getStreamingChatMessageContentsAsync から始め、issue 内の ToolCallBehavior.allowAllKernelFunctions(false) の例を使って、その動作を getChatMessageContentsAsync と比較します。OpenAIStreamingChatMessageContent がツール呼び出しをどのように公開しているかを追跡します。ストリーミング結果に空の配列ではなく、期待されるツール呼び出しデータが含まれ、この再現ケースをカバーできれば完了です。

Describe the bug
I try to invoke toolcall myself in a streaming chat.
I have learned that how to invoke a toolcall in an non-streaming chat. like

        Kernel kernel = Kernel.builder().withAIService(ChatCompletionService.class, chatCompletionService)
                .withPlugin(KernelPluginFactory.createFromObject(this, "time"))
                .build();

        chatCompletionService
                .getChatMessageContentsAsync("what time is it now?", kernel, InvocationContext.builder()
                        .withToolCallBehavior(ToolCallBehavior.allowAllKernelFunctions(false))
                        .build())
                .block()
                .stream().filter(it->it instanceof OpenAIChatMessageContent<?>)
                .map(it->((OpenAIChatMessageContent)it))
                .forEach(it->{
                    System.out.println(it.getToolCall().size());
                });

As you can see, I can get the toolCall value;

but when I change to an streaming chat, like

        Kernel kernel = Kernel.builder().withAIService(ChatCompletionService.class, chatCompletionService)
                .withPlugin(KernelPluginFactory.createFromObject(this, "time"))
                .build();

        chatCompletionService
                .getStreamingChatMessageContentsAsync("what time is it now?", kernel, InvocationContext.builder()
                        .withToolCallBehavior(ToolCallBehavior.allowAllKernelFunctions(false))
                        .build())
                .filter(it->it instanceof OpenAIStreamingChatMessageContent<?>)
                .map(it->(OpenAIStreamingChatMessageContent)it)
                .doOnNext(it->{
                    System.out.println(it.getToolCall().size());
                }).subscribe();

the toolCall will always be an empty array.