add search feature

[XORbit01]

like yt-dlp add the search feature, so we can search for videos and get the details, cz in my project I use your lib for downloading and yt-dlp for searching videos because your lib is much faster.

[ppalone]

@XORbit01 I made a small Go library https://github.com/ppalone/ytsearch for searching videos. See if it works for you :)