refact: reorganize utility modules

src/kleinanzeigen_bot/utils/net.py

@@ -0,0 +1,20 @@
+"""
+SPDX-FileCopyrightText: © Sebastian Thomschke and contributors
+SPDX-License-Identifier: AGPL-3.0-or-later
+SPDX-ArtifactOfProjectHomePage: https://github.com/Second-Hand-Friends/kleinanzeigen-bot/
+"""
+import socket
+
+
+def is_port_open(host:str, port:int) -> bool:
+    s:socket.socket | None = None
+    try:
+        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        s.settimeout(1)
+        s.connect((host, port))
+        return True
+    except Exception:
+        return False
+    finally:
+        if s:
+            s.close()