Add support for SSL client certificate authentication (#3435)

Adds `--client-certificate`, `--client-certificate-key`, `--client-certificate-password`

Authored-by: coletdjnz
Co-authored-by: df <fieldhouse@gmx.net>
Co-authored-by: pukkandan <pukkandan.ytdlp@gmail.com>

README.md

@@ -840,6 +840,15 @@ You can also fork the project on github and run your fork's [build workflow](.gi
                                      interactively
     --ap-list-mso                    List all supported multiple-system
                                      operators
+    --client-certificate CERTFILE    Path to client certificate file in PEM
+                                     format. May include the private key
+    --client-certificate-key KEYFILE Path to private key file for client
+                                     certificate
+    --client-certificate-password PASSWORD
+                                     Password for client certificate private
+                                     key, if encrypted. If not provided and the
+                                     key is encrypted, yt-dlp will ask
+                                     interactively
 
 ## Post-Processing Options:
     -x, --extract-audio              Convert video files to audio-only files