[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/duckduckgo_definitions.py

@@ -13,8 +13,6 @@ most of the features are based on English terms.
 
 """
 
-from typing import TYPE_CHECKING
-
 from urllib.parse import urlencode, urlparse, urljoin
 from lxml import html
 
@@ -23,11 +21,6 @@ from searx.utils import extract_text, html_to_text, get_string_replaces_function
 from searx.external_urls import get_external_url, get_earth_coordinates_url, area_to_osm_zoom
 from searx.result_types import EngineResults
 
-if TYPE_CHECKING:
-    import logging
-
-    logger: logging.Logger
-
 # about
 about = {
     "website": 'https://duckduckgo.com/',