community[minor]: add coze chat model (#20770)

add coze chat model, to call coze.com apis

libs/community/tests/integration_tests/chat_models/test_coze.py

@@ -0,0 +1,36 @@
+from langchain_core.messages import AIMessage, HumanMessage
+
+from langchain_community.chat_models.coze import ChatCoze
+
+# For testing, run:
+# TEST_FILE=tests/integration_tests/chat_models/test_coze.py make test
+
+
+def test_chat_coze_default() -> None:
+    chat = ChatCoze(
+        coze_api_base="https://api.coze.com",
+        coze_api_key="pat_...",
+        bot_id="7....",
+        user="123",
+        conversation_id="",
+        streaming=True,
+    )
+    message = HumanMessage(content="请完整背诵将进酒，背诵5遍")
+    response = chat([message])
+    assert isinstance(response, AIMessage)
+    assert isinstance(response.content, str)
+
+
+def test_chat_coze_default_non_streaming() -> None:
+    chat = ChatCoze(
+        coze_api_base="https://api.coze.com",
+        coze_api_key="pat_...",
+        bot_id="7....",
+        user="123",
+        conversation_id="",
+        streaming=False,
+    )
+    message = HumanMessage(content="请完整背诵将进酒，背诵5遍")
+    response = chat([message])
+    assert isinstance(response, AIMessage)
+    assert isinstance(response.content, str)