feat: allow auto-restart on captcha (#481)

Co-authored-by: sebthom <sebthom@users.noreply.github.com>

src/kleinanzeigen_bot/utils/exceptions.py

@@ -0,0 +1,18 @@
+"""
+SPDX-FileCopyrightText: © Sebastian Thomschke and contributors
+SPDX-License-Identifier: AGPL-3.0-or-later
+SPDX-ArtifactOfProjectHomePage: https://github.com/Second-Hand-Friends/kleinanzeigen-bot/
+"""
+from datetime import timedelta
+
+
+class KleinanzeigenBotError(RuntimeError):
+    """Base class for all custom bot-related exceptions."""
+
+
+class CaptchaEncountered(KleinanzeigenBotError):
+    """Raised when a Captcha was detected and auto-restart is enabled."""
+
+    def __init__(self, restart_delay: timedelta):
+        super().__init__()
+        self.restart_delay = restart_delay