[mod] addition of various type hints / tbc

- pyright configuration [1]_
- stub files: types-lxml [2]_
- addition of various type hints
- enable use of new type system features on older Python versions [3]_
- ``.tool-versions`` - set python to lowest version we support (3.10.18) [4]_:
  Older versions typically lack some typing features found in newer Python
  versions.  Therefore, for local type checking (before commit), it is necessary
  to use the older Python interpreter.

.. [1] https://docs.basedpyright.com/v1.20.0/configuration/config-files/
.. [2] https://pypi.org/project/types-lxml/
.. [3] https://typing-extensions.readthedocs.io/en/latest/#
.. [4] https://mise.jdx.dev/configuration.html#tool-versions

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Format: reST

searx/engines/bing_videos.py

@@ -3,24 +3,15 @@
 """Bing-Videos: description see :py:obj:`searx.engines.bing`.
 """
 
-from typing import TYPE_CHECKING
 import json
 from urllib.parse import urlencode
 
 from lxml import html
 
-from searx.enginelib.traits import EngineTraits
 from searx.engines.bing import set_bing_cookies
 from searx.engines.bing import fetch_traits  # pylint: disable=unused-import
 from searx.engines.bing_images import time_map
 
-if TYPE_CHECKING:
-    import logging
-
-    logger: logging.Logger
-
-traits: EngineTraits
-
 
 about = {
     "website": 'https://www.bing.com/videos',