Cleanup: Remove unused CallPromptResponseSpec and StreamPromptResponseSpec

Auto-cherry-pick to 1.0.x
Fixes #4020

Signed-off-by: YunKui Lu <[email protected]>

Author: YunKuiLu

spring-ai-client-chat/src/main/java/org/springframework/ai/chat/client/ChatClient.java

@@ -190,24 +190,6 @@ interface StreamResponseSpec {
 
 	}
 
-	interface CallPromptResponseSpec {
-
-		String content();
-
-		List<String> contents();
-
-		ChatResponse chatResponse();
-
-	}
-
-	interface StreamPromptResponseSpec {
-
-		Flux<ChatResponse> chatResponse();
-
-		Flux<String> content();
-
-	}
-
 	interface ChatClientRequestSpec {
 
 		/**