Unable to fetch OpenAI Log Probs when enabled in ChatOptions

[ndoe049]

Bug description
When requesting logprobs generation from OpenAI via OpenAiChatOptions the logprobs are generated, but never returned as part of the ChatResponse.

OpenAiChatOptions.builder().logprobs(true).build()

Environment
Spring AI: 1.0.0-M7
Java: 21

Steps to reproduce

1. Configure ChatClient with logprobs enabled in the ChatOptions
2. Make Call to model

Expected behavior
Similar to other metadata, logprobs should be returned as part of the metadata.

i.e.

chatClient.call()
				.chatResponse()
				.getMetadata()
				.get("logprobs");

Minimal Complete Reproducible example

@Bean
	ApplicationRunner applicationRunner(ChatClient.Builder builder) {
		return args -> System.out.println(builder
				.defaultAdvisors(new PromptChatMemoryAdvisor(new InMemoryChatMemory()))
				.defaultOptions(OpenAiChatOptions.builder().logprobs(true).build())
				.build().prompt().system("You are a friendly assistant helping answer questions about pets")
				.user("What is the best pet?")
				.call()
				.chatResponse()
				.getMetadata()
				.keySet());
	}

Example Output:

[system-fingerprint, created]

[markpollack]

I fetched the changes in your repo. I modified the if statement to not be if/else as I don't think those conditions are mutually exclusive.

merged in 8acf4b9