[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/annas_archive.py

@@ -32,18 +32,24 @@ Implementations
 ===============
 
 """
+import typing as t
 
-from typing import List, Dict, Any, Optional
 from urllib.parse import urlencode
 from lxml import html
+from lxml.etree import ElementBase
 
 from searx.utils import extract_text, eval_xpath, eval_xpath_getindex, eval_xpath_list
 from searx.enginelib.traits import EngineTraits
 from searx.data import ENGINE_TRAITS
 from searx.exceptions import SearxEngineXPathException
 
+from searx.result_types import EngineResults
+
+if t.TYPE_CHECKING:
+    from searx.extended_types import SXNG_Response
+
 # about
-about: Dict[str, Any] = {
+about: dict[str, t.Any] = {
     "website": "https://annas-archive.org/",
     "wikidata_id": "Q115288326",
     "official_api_documentation": None,
@@ -53,7 +59,7 @@ about: Dict[str, Any] = {
 }
 
 # engine dependent config
-categories: List[str] = ["files"]
+categories: list[str] = ["files"]
 paging: bool = True
 
 # search-url
@@ -85,7 +91,7 @@ aa_ext: str = ''
 """
 
 
-def init(engine_settings=None):  # pylint: disable=unused-argument
+def init(engine_settings: dict[str, t.Any]) -> None:  # pylint: disable=unused-argument
     """Check of engine's settings."""
     traits = EngineTraits(**ENGINE_TRAITS['annas archive'])
 
@@ -99,8 +105,8 @@ def init(engine_settings=None):  # pylint: disable=unused-argument
         raise ValueError(f'invalid setting ext: {aa_ext}')
 
 
-def request(query, params: Dict[str, Any]) -> Dict[str, Any]:
-    lang = traits.get_language(params["language"], traits.all_locale)  # type: ignore
+def request(query: str, params: dict[str, t.Any]) -> None:
+    lang = traits.get_language(params["language"], traits.all_locale)
     args = {
         'lang': lang,
         'content': aa_content,
@@ -112,11 +118,10 @@ def request(query, params: Dict[str, Any]) -> Dict[str, Any]:
     # filter out None and empty values
     filtered_args = dict((k, v) for k, v in args.items() if v)
     params["url"] = f"{base_url}/search?{urlencode(filtered_args)}"
-    return params
 
 
-def response(resp) -> List[Dict[str, Optional[str]]]:
-    results: List[Dict[str, Optional[str]]] = []
+def response(resp: "SXNG_Response") -> EngineResults:
+    res = EngineResults()
     dom = html.fromstring(resp.text)
 
     # The rendering of the WEB page is strange; positions of Anna's result page
@@ -126,16 +131,17 @@ def response(resp) -> List[Dict[str, Optional[str]]]:
 
     for item in eval_xpath_list(dom, '//main//div[contains(@class, "js-aarecord-list-outer")]/div'):
         try:
-            results.append(_get_result(item))
+            kwargs: dict[str, t.Any] = _get_result(item)
         except SearxEngineXPathException:
-            pass
-    return results
+            continue
+        res.add(res.types.LegacyResult(**kwargs))
+    return res
 
 
-def _get_result(item):
+def _get_result(item: ElementBase) -> dict[str, t.Any]:
     return {
         'template': 'paper.html',
-        'url': base_url + extract_text(eval_xpath_getindex(item, './a/@href', 0)),
+        'url': base_url + eval_xpath_getindex(item, './a/@href', 0),
         'title': extract_text(eval_xpath(item, './div//a[starts-with(@href, "/md5")]')),
         'authors': [extract_text(eval_xpath_getindex(item, './/a[starts-with(@href, "/search")]', 0))],
         'publisher': extract_text(
@@ -160,9 +166,9 @@ def fetch_traits(engine_traits: EngineTraits):
     engine_traits.custom['sort'] = []
 
     resp = get(base_url + '/search')
-    if not resp.ok:  # type: ignore
+    if not resp.ok:
         raise RuntimeError("Response from Anna's search page is not OK.")
-    dom = html.fromstring(resp.text)  # type: ignore
+    dom = html.fromstring(resp.text)
 
     # supported language codes