[rh:requests] Add handler for requests HTTP library (#3668)

Adds support for HTTPS proxies and persistent connections (keep-alive)

Closes https://github.com/yt-dlp/yt-dlp/issues/1890
Resolves https://github.com/yt-dlp/yt-dlp/issues/4070
Resolves https://github.com/ytdl-org/youtube-dl/issues/32549
Resolves https://github.com/ytdl-org/youtube-dl/issues/14523
Resolves https://github.com/ytdl-org/youtube-dl/issues/13734

Authored by: coletdjnz, Grub4K, bashonly

yt_dlp/dependencies/__init__.py

@@ -58,6 +58,15 @@ except (ImportError, SyntaxError):
     # See https://github.com/yt-dlp/yt-dlp/issues/2633
     websockets = None
 
+try:
+    import urllib3
+except ImportError:
+    urllib3 = None
+
+try:
+    import requests
+except ImportError:
+    requests = None
 
 try:
     import xattr  # xattr or pyxattr