F proxy ytdlp

[mfarre]

• [ x] I have read CONTRIBUTE.md

With this PR it is possible to configure yt_dlp with a proxy and with a flag check the proxy certificate or ignore it.

In the YAML configuration:
reading:
yt_args:
proxy: "<proxy_address>"
proxy-check-certificate: False

[rom1504]

Hey, I think these points would help

• Making the ci pass
• Adding a test using a proxy (either an open one publicly available or starting a local one in the CI for testing purposes)
• Adding a note in the readme about proxy support
• Adding recommendation on what proxy / proxy software to use and speeds observed if using a proxy

The first point is necessary. The rest would be nice

[mfarre]

thanks @rom1504, I think I addressed some changes that should make the CI go, added some comments in the readme and more general details in the yt-dlp specific examples section.