[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/_core.py

@@ -11,6 +11,7 @@ import inspect
 import logging
 import re
 import typing
+from collections.abc import Sequence
 
 from dataclasses import dataclass, field
 
@@ -89,7 +90,7 @@ class Plugin(abc.ABC):
 
     fqn: str = ""
 
-    def __init__(self, plg_cfg: PluginCfg) -> None:
+    def __init__(self, plg_cfg: "PluginCfg") -> None:
         super().__init__()
         if not self.fqn:
             self.fqn = self.__class__.__mro__[0].__module__
@@ -120,7 +121,7 @@ class Plugin(abc.ABC):
 
         return id(self)
 
-    def __eq__(self, other):
+    def __eq__(self, other: typing.Any):
         """py:obj:`Plugin` objects are equal if the hash values of the two
         objects are equal."""
 
@@ -166,7 +167,7 @@ class Plugin(abc.ABC):
         """
         return True
 
-    def post_search(self, request: SXNG_Request, search: "SearchWithPlugins") -> None | typing.Sequence[Result]:
+    def post_search(self, request: SXNG_Request, search: "SearchWithPlugins") -> None | Sequence[Result]:
         """Runs AFTER the search request.  Can return a list of
         :py:obj:`Result <searx.result_types._base.Result>` objects to be added to the
         final result list."""
@@ -207,7 +208,7 @@ class PluginStorage:
 
         return [p.info for p in self.plugin_list]
 
-    def load_settings(self, cfg: dict[str, dict]):
+    def load_settings(self, cfg: dict[str, dict[str, typing.Any]]):
         """Load plugins configured in SearXNG's settings :ref:`settings
         plugins`."""