ChatClient already provides the .chatResponse() method to return the entire ChatResponse instance.
It also provides a set of overloaded .entity(Type) methods to provide Type-converted responses.
The new .responseEntity(Type) method returns a ResponseEntity<ChatResponse, T> instance, encapsulating
both the ChatResponse and the requested Type-converted response entity.
This change allows for more flexibility when handling different response types and facilitates
easier integration with other components that expect ResponseEntity instances.
d6a0dffd3e