feat: add plugin global config to support docker volumes

plugins/plugin.py

@@ -1,6 +1,16 @@
+import os
+from config import pconf
+
 class Plugin:
     def __init__(self):
         self.handlers = {}
 
+    def load_config(self) -> dict:
+        """
+        加载当前插件配置
+        :return: 插件配置字典
+        """
+        return pconf(self.name)
+
     def get_help_text(self, **kwargs):
         return "暂无帮助信息"