[improvement](chat) remove Python service and rewrite it using a Java project (#428)

launchers/standalone/src/main/resources/application-local.yaml

@@ -39,19 +39,4 @@ llm:
 embedding:
   url: http://127.0.0.1:9092
 functionCall:
-  url: http://127.0.0.1:9092
-
-
-langchain4j:
-  chat-model:
-    provider: open_ai
-    openai:
-      api-key: api_key
-      model-name: gpt-3.5-turbo
-      temperature: 0.0
-      timeout: PT60S
-
-logging:
-  level:
-    dev.langchain4j: DEBUG
-    dev.ai4j.openai4j: DEBUG
+  url: http://127.0.0.1:9092