[fix] engine & network issues / documentation and type annotations

This patch fixes some quirks and issues related to the engines and the network.
Each engine has its own network and this network was broken for the following
engines[1]:

- archlinux
- bing
- dailymotion
- duckduckgo
- google
- peertube
- startpage
- wikipedia

Since the files have been touched anyway, the type annotaions of the engine
modules has also been completed so that error messages from the type checker are
no longer reported.

Related and (partial) fixed issue:

- [1] https://github.com/searxng/searxng/issues/762#issuecomment-1605323861
- [2] https://github.com/searxng/searxng/issues/2513
- [3] https://github.com/searxng/searxng/issues/2515

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/google.py

@@ -23,7 +23,7 @@ import babel.languages
 
 from searx.utils import extract_text, eval_xpath, eval_xpath_list, eval_xpath_getindex
 from searx.locales import language_tag, region_tag, get_offical_locales
-from searx import network
+from searx.network import get  # see https://github.com/searxng/searxng/issues/762
 from searx.exceptions import SearxEngineCaptchaException
 from searx.enginelib.traits import EngineTraits
 
@@ -419,11 +419,11 @@ def fetch_traits(engine_traits: EngineTraits, add_domains: bool = True):
 
     engine_traits.custom['supported_domains'] = {}
 
-    resp = network.get('https://www.google.com/preferences')
-    if not resp.ok:
+    resp = get('https://www.google.com/preferences')
+    if not resp.ok:  # type: ignore
         raise RuntimeError("Response from Google's preferences is not OK.")
 
-    dom = html.fromstring(resp.text)
+    dom = html.fromstring(resp.text)  # type: ignore
 
     # supported language codes
 
@@ -474,18 +474,18 @@ def fetch_traits(engine_traits: EngineTraits, add_domains: bool = True):
     # supported domains
 
     if add_domains:
-        resp = network.get('https://www.google.com/supported_domains')
-        if not resp.ok:
+        resp = get('https://www.google.com/supported_domains')
+        if not resp.ok:  # type: ignore
             raise RuntimeError("Response from https://www.google.com/supported_domains is not OK.")
 
-        for domain in resp.text.split():
+        for domain in resp.text.split():  # type: ignore
             domain = domain.strip()
             if not domain or domain in [
                 '.google.com',
             ]:
                 continue
             region = domain.split('.')[-1].upper()
-            engine_traits.custom['supported_domains'][region] = 'www' + domain
+            engine_traits.custom['supported_domains'][region] = 'www' + domain  # type: ignore
             if region == 'HK':
                 # There is no google.cn, we use .com.hk for zh-CN
-                engine_traits.custom['supported_domains']['CN'] = 'www' + domain
+                engine_traits.custom['supported_domains']['CN'] = 'www' + domain  # type: ignore