add type checking, update deletion function in searchpage, add function to import apparat data from document

src/utils/blob.py

@@ -1,4 +1,4 @@
-def create_blob(file):
+def create_blob(file: str):
     """
     Creates a blob from a file.
     """

src/utils/pickles.py

@@ -1,9 +1,10 @@
 import pickle
+from typing import Any
 
 
-def load_pickle(data):
+def load_pickle(data: Any):
     return pickle.loads(data)
 
 
-def dump_pickle(data):
+def dump_pickle(data: Any):
     return pickle.dumps(data)