[Executor] Move forward_meta.py to fastdeploy/model_executor (#2774)

* Use PEP 563 in attention.py and fix conflict

* merge commit

* Change what was left out last time

fastdeploy/model_executor/layers/attention/base_attention_backend.py

@@ -21,10 +21,11 @@ from __future__ import annotations
 
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
+from typing import TYPE_CHECKING
 
 import paddle
-
-from fastdeploy.worker.forward_meta import ForwardMeta
+if TYPE_CHECKING:
+    from fastdeploy.model_executor.forward_meta import ForwardMeta
 
 
 @dataclass