[FEATURE] UX: validate AI Service configuration before runtime

[langchain4j]

When AI Service method is wrongly configured (e.g. multiple parameters withtout any annotations), an exception will be thrown at runtime, right before this method is called:

dev.langchain4j.exception.IllegalConfigurationException: Parameter 'arg0' of method 'translate' should be annotated with @V or @UserMessage or @UserName or @MemoryId
	at dev.langchain4j.exception.IllegalConfigurationException.illegalConfiguration(IllegalConfigurationException.java:16)
	at dev.langchain4j.service.DefaultAiServices.validateParameters(DefaultAiServices.java:51)
	at dev.langchain4j.service.DefaultAiServices$1.invoke(DefaultAiServices.java:85)

Ideally this validation should be performed as early as possible, at the time of AI Service creation or even better, during compilation.