[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/chinaso.py

@@ -54,8 +54,8 @@ Implementations
 
 """
 
+import typing as t
 import base64
-import typing
 import secrets
 
 from urllib.parse import urlencode
@@ -78,7 +78,7 @@ time_range_support = True
 results_per_page = 10
 categories = []
 
-ChinasoCategoryType = typing.Literal['news', 'videos', 'images']
+ChinasoCategoryType = t.Literal['news', 'videos', 'images']
 """ChinaSo supports news, videos, images search.
 
 - ``news``: search for news
@@ -91,7 +91,7 @@ In the category ``news`` you can additionally filter by option
 chinaso_category = 'news'
 """Configure ChinaSo category (:py:obj:`ChinasoCategoryType`)."""
 
-ChinasoNewsSourceType = typing.Literal['CENTRAL', 'LOCAL', 'BUSINESS', 'EPAPER', 'all']
+ChinasoNewsSourceType = t.Literal['CENTRAL', 'LOCAL', 'BUSINESS', 'EPAPER', 'all']
 """Filtering ChinaSo-News results by source:
 
 - ``CENTRAL``: central publication
@@ -111,7 +111,7 @@ base_url = "https://www.chinaso.com"
 def init(_):
     if chinaso_category not in ('news', 'videos', 'images'):
         raise ValueError(f"Unsupported category: {chinaso_category}")
-    if chinaso_category == 'news' and chinaso_news_source not in typing.get_args(ChinasoNewsSourceType):
+    if chinaso_category == 'news' and chinaso_news_source not in t.get_args(ChinasoNewsSourceType):
         raise ValueError(f"Unsupported news source: {chinaso_news_source}")