modify: 插件初始化

src/chongming_worker/__init__.py

@@ -22,6 +22,9 @@ from chongming_worker.runtime import (
     create_worker,
     create_workers,
 )
+from chongming_worker.plugin import (
+    Plugin,
+)
 
 __all__ = [
     "RPCMethod",
@@ -37,4 +40,5 @@ __all__ = [
     "OperationConfig",
     "create_worker",
     "create_workers",
+    "Plugin",
 ]