SimpleLoggerAdvisor should allow JSON formatting

I am using a SimpleLoggerAdvisor as follows:

public BookRecommendationService(ChatClient.Builder builder) {
        this.chatClient = builder.defaultAdvisors(new SimpleLoggerAdvisor()).build();
 }

It works well, except that the JSON snippets in the logs are heard to read:

2024-09-15T22:16:35.519+08:00 DEBUG 28615 --- [spring-ai-samples2] [           main] o.s.a.c.c.advisor.SimpleLoggerAdvisor    : response: {"result":{"output":{"messageType":"ASSISTANT",
"metadata":{"refusal":"","finishReason":"STOP","index":0,"id":"chatcmpl-A7kLD5Ez8836Wq9a6RKfqh7d3PJYv","role":"ASSISTANT","messageType":"ASSISTANT"},
"toolCalls":[],"content":"{\n  \"author\": \"Bonnie Garmus\",\n  \"title\": \"Lessons in Chemistry\"\n}"},"metadata":
{"contentFilterMetadata":null,"finishReason":"STOP"}},`...

It would be nice if there was a way to format the JSON snippets properly in the logs, so it would be more readable and also would not display the '\n' instructions.

Thanks again for the great work!

Start at the SimpleLoggerAdvisor entry point and inspect how its response is written to the logs. Reproduce the escaped JSON output shown in the issue, then determine the formatting behavior needed so nested JSON is readable without literal newline escapes; done means the logged response is clearly formatted.