[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/startpage.py

@@ -78,9 +78,9 @@ Startpage's category (for Web-search, News, Videos, ..) is set by
 
 """
 # pylint: disable=too-many-statements
-from __future__ import annotations
 
-from typing import TYPE_CHECKING, Any
+import typing as t
+
 from collections import OrderedDict
 import re
 from unicodedata import normalize, combining
@@ -98,13 +98,6 @@ from searx.locales import region_tag
 from searx.enginelib.traits import EngineTraits
 from searx.enginelib import EngineCache
 
-if TYPE_CHECKING:
-    import logging
-
-    logger: logging.Logger
-
-traits: EngineTraits
-
 # about
 about = {
     "website": 'https://startpage.com',
@@ -377,7 +370,7 @@ def _get_news_result(result):
     }
 
 
-def _get_image_result(result) -> dict[str, Any] | None:
+def _get_image_result(result) -> dict[str, t.Any] | None:
     url = result.get('altClickUrl')
     if not url:
         return None