feat:添加思考状态发送，优化s4u队列

src/mais4u/mais4u_chat/loading.py

@@ -0,0 +1,31 @@
+import asyncio
+import json
+import time
+
+from src.chat.message_receive.message import MessageRecv
+from src.llm_models.utils_model import LLMRequest
+from src.common.logger import get_logger
+from src.chat.utils.chat_message_builder import build_readable_messages, get_raw_msg_by_timestamp_with_chat_inclusive
+from src.config.config import global_config
+from src.chat.utils.prompt_builder import Prompt, global_prompt_manager
+from src.manager.async_task_manager import AsyncTask, async_task_manager
+from src.plugin_system.apis import send_api
+
+async def send_loading(chat_id: str, content: str):
+    await send_api.custom_to_stream(
+        message_type="loading",
+        content=content,
+        stream_id=chat_id,
+        storage_message=False,
+        show_log=True,
+    )
+    
+async def send_unloading(chat_id: str):
+    await send_api.custom_to_stream(
+        message_type="loading",
+        content="",
+        stream_id=chat_id,
+        storage_message=False,
+        show_log=True,
+    )
+