[rh:websockets] Migrate websockets to networking framework (#7720)

* Adds a basic WebSocket framework
* Introduces new minimum `websockets` version of 12.0
* Deprecates `WebSocketsWrapper`

Fixes https://github.com/yt-dlp/yt-dlp/issues/8439

Authored by: coletdjnz

yt_dlp/YoutubeDL.py

@@ -4052,6 +4052,7 @@ class YoutubeDL:
             return self._request_director.send(req)
         except NoSupportingHandlers as e:
             for ue in e.unsupported_errors:
+                # FIXME: This depends on the order of errors.
                 if not (ue.handler and ue.msg):
                     continue
                 if ue.handler.RH_KEY == 'Urllib' and 'unsupported url scheme: "file"' in ue.msg.lower():
@@ -4061,6 +4062,15 @@ class YoutubeDL:
                 if 'unsupported proxy type: "https"' in ue.msg.lower():
                     raise RequestError(
                         'To use an HTTPS proxy for this request, one of the following dependencies needs to be installed: requests')
+
+                elif (
+                    re.match(r'unsupported url scheme: "wss?"', ue.msg.lower())
+                    and 'websockets' not in self._request_director.handlers
+                ):
+                    raise RequestError(
+                        'This request requires WebSocket support. '
+                        'Ensure one of the following dependencies are installed: websockets',
+                        cause=ue) from ue
             raise
         except SSLError as e:
             if 'UNSAFE_LEGACY_RENEGOTIATION_DISABLED' in str(e):