Support to autoconfigure multiple chat models at same time

[quaff]

Given:

implementation("org.springframework.ai:spring-ai-starter-model-deepseek")
implementation("org.springframework.ai:spring-ai-starter-model-ollama")

Application failed to start before this commit:

***************************
APPLICATION FAILED TO START
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Description:

Parameter 1 of method chatClientBuilder in org.springframework.ai.model.chat.client.autoconfigure.ChatClientAutoConfiguration required a single bean, but 2 were found:
	- deepSeekChatModel: defined by method 'deepSeekChatModel' in class path resource [org/springframework/ai/model/deepseek/autoconfigure/DeepSeekChatAutoConfiguration.class]
	- ollamaChatModel: defined by method 'ollamaChatModel' in class path resource [org/springframework/ai/model/ollama/autoconfigure/OllamaChatAutoConfiguration.class]

After this commit, we could construct our own instead of autoconfigured ChatClient.Builder by injecting qualified ChatModel.

Related to GH-2221.

[markpollack]

Hi. How does this PR work to achieve the goal of injecting by qualified chat model? Holding off on this until the GA release.

[quaff]

Hi. How does this PR work to achieve the goal of injecting by qualified chat model? Holding off on this until the GA release.

Application could define their own ChatClient.Builders like this:

	@Bean
	@Scope("prototype")
	ChatClient.Builder deepSeekChatClientBuilder(ChatClientBuilderConfigurer chatClientBuilderConfigurer, @Qualifier("deepSeekChatModel") ChatModel deepSeekChatModel,
										 ObjectProvider<ObservationRegistry> observationRegistry,
										 ObjectProvider<ChatClientObservationConvention> observationConvention) {
		ChatClient.Builder builder = ChatClient.builder(deepSeekChatModel,
				observationRegistry.getIfUnique(() -> ObservationRegistry.NOOP),
				observationConvention.getIfUnique(() -> null));
		return chatClientBuilderConfigurer.configure(builder);
	}

	@Bean
	@Scope("prototype")
	ChatClient.Builder ollamaChatClientBuilder(ChatClientBuilderConfigurer chatClientBuilderConfigurer, @Qualifier("ollamaChatModel") ChatModel ollamaChatModel,
												 ObjectProvider<ObservationRegistry> observationRegistry,
												 ObjectProvider<ChatClientObservationConvention> observationConvention) {
		ChatClient.Builder builder = ChatClient.builder(ollamaChatModel,
				observationRegistry.getIfUnique(() -> ObservationRegistry.NOOP),
				observationConvention.getIfUnique(() -> null));
		return chatClientBuilderConfigurer.configure(builder);
	}

[quaff]

@markpollack WDYT?