Add isort to the pre-commit configuration and apply it to the whole project (#595)

* Apply isort to the entire repository
* Fix missing import issues in text_to_entries
* Fix imports in migration files

tests/test_gpt4all_chat_actors.py

@@ -1,7 +1,5 @@
-# Standard Packages
 from datetime import datetime
 
-# External Packages
 import pytest
 
 SKIP_TESTS = True
@@ -18,10 +16,13 @@ try:
 except ModuleNotFoundError as e:
     print("There was an error importing GPT4All. Please run pip install gpt4all in order to install it.")
 
-# Internal Packages
-from khoj.processor.conversation.offline.chat_model import converse_offline, extract_questions_offline, filter_questions
-from khoj.processor.conversation.offline.utils import download_model
 
+from khoj.processor.conversation.offline.chat_model import (
+    converse_offline,
+    extract_questions_offline,
+    filter_questions,
+)
+from khoj.processor.conversation.offline.utils import download_model
 from khoj.processor.conversation.utils import message_to_log
 
 MODEL_NAME = "mistral-7b-instruct-v0.1.Q4_0.gguf"