[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/plugins/tracker_url_remover.py

@@ -1,28 +1,27 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 # pylint: disable=missing-module-docstring, unused-argument
 
-from __future__ import annotations
-
 import logging
-import typing
+import typing as t
 
-from flask_babel import gettext
+from flask_babel import gettext  # pyright: ignore[reportUnknownVariableType]
 
 from searx.data import TRACKER_PATTERNS
 
 from . import Plugin, PluginInfo
 
-if typing.TYPE_CHECKING:
+if t.TYPE_CHECKING:
     import flask
     from searx.search import SearchWithPlugins
     from searx.extended_types import SXNG_Request
-    from searx.result_types import Result, LegacyResult
+    from searx.result_types import Result, LegacyResult  # pyright: ignore[reportPrivateLocalImportUsage]
     from searx.plugins import PluginCfg
 
 
 log = logging.getLogger("searx.plugins.tracker_url_remover")
 
 
+@t.final
 class SXNGPlugin(Plugin):
     """Remove trackers arguments from the returned URL."""
 
@@ -42,7 +41,7 @@ class SXNGPlugin(Plugin):
         TRACKER_PATTERNS.init()
         return True
 
-    def on_result(self, request: "SXNG_Request", search: "SearchWithPlugins", result: Result) -> bool:
+    def on_result(self, request: "SXNG_Request", search: "SearchWithPlugins", result: "Result") -> bool:
 
         result.filter_urls(self.filter_url_field)
         return True