Revert "Cache Manifest files (#787)"

This reverts commit 1971fcf.

Author: kevinjqliu

pyiceberg/table/snapshots.py

@@ -19,7 +19,6 @@
 import time
 from collections import defaultdict
 from enum import Enum
-from functools import lru_cache
 from typing import TYPE_CHECKING, Any, DefaultDict, Dict, Iterable, List, Mapping, Optional
 
 from pydantic import Field, PrivateAttr, model_serializer
@@ -231,13 +230,6 @@ def __eq__(self, other: Any) -> bool:
         )
 
 
-@lru_cache
-def _manifests(io: FileIO, manifest_list: str) -> List[ManifestFile]:
-    """Return the manifests from the manifest list."""
-    file = io.new_input(manifest_list)
-    return list(read_manifest_list(file))
-
-
 class Snapshot(IcebergBaseModel):
     snapshot_id: int = Field(alias="snapshot-id")
     parent_snapshot_id: Optional[int] = Field(alias="parent-snapshot-id", default=None)
@@ -258,9 +250,9 @@ def __str__(self) -> str:
         return result_str
 
     def manifests(self, io: FileIO) -> List[ManifestFile]:
-        """Return the manifests for the given snapshot."""
-        if self.manifest_list:
-            return _manifests(io, self.manifest_list)
+        if self.manifest_list is not None:
+            file = io.new_input(self.manifest_list)
+            return list(read_manifest_list(file))
         return []