Add ability to uninstall service

src/primaite/simulator/file_system/file_system.py

@@ -1,5 +1,5 @@
 from random import choice
-from typing import Dict, Optional
+from typing import Dict, Optional, Union
 
 from primaite import getLogger
 from primaite.simulator.core import SimComponent
@@ -211,7 +211,7 @@ class FileSystem(SimComponent):
             if file is not None:
                 return file
 
-    def get_folder_by_name(self, folder_name: str) -> FileSystemFolder:
+    def get_folder_by_name(self, folder_name: str) -> Union[FileSystemFolder, None]:
         """
         Returns a the first folder with a matching name.