feature：为合并mian做准备

main/xiaozhi-server/core/providers/memory/mem_custom/mem_custom.py

@@ -0,0 +1,18 @@
+'''
+自定义记忆，可以选择此模块
+'''
+from ..base import MemoryProviderBase, logger
+
+TAG = __name__
+
+class MemoryProvider(MemoryProviderBase):
+    def __init__(self, config):
+        super().__init__(config)
+      
+    async def save_memory(self, msgs):
+        logger.bind(tag=TAG).debug("mem_custom mode: Custom memory saving is performed.")
+        return None
+
+    async def query_memory(self, query: str)-> str:
+        logger.bind(tag=TAG).debug("mem_custom mode: Custom memory query is performed.")
+        return ""