Tidy ups + unit tests:

1. Allow loading modules from --module_paths=/extra/path/here
2. Improved unit tests for module loading
3. Further small tidy ups/clean ups

src/auto_archiver/utils/misc.py

@@ -1,7 +1,10 @@
 
-import os, json, requests
+
+import os
+import json
 import uuid
 from datetime import datetime
+import requests
 from loguru import logger