Refactor authentication functions and move them to a new utils module

src/utils.py

@@ -0,0 +1,15 @@
+import keyring
+
+def saveauth(service, username, data, chunk_size=1000):
+    chunks = [data[i:i+chunk_size] for i in range(0, len(data), chunk_size)]
+    keyring.set_password(service, f"{username}_count", str(len(chunks)))
+    
+    for i, chunk in enumerate(chunks):
+        keyring.set_password(service, f"{username}_{i}", chunk)
+    
+def loadauth(service, username):
+    try:
+        count = int(keyring.get_password(service, f"{username}_count"))
+        return "".join(keyring.get_password(service, f"{username}_{i}") or "" for i in range(count))
+    except (TypeError, ValueError):
+        return None