[Feature Request] Add a column for public release date

[Bakr-Ali]

I'm not sure if this is only applicable to Members only videos, but sometimes the "Publish" date in MW Metadata isn't the same as the publicly shown "Upload" date on the video's page.

For example, the second video in the following playlist https://mattw.io/youtube-metadata/bulk?url=https%3A%2F%2Fwww.youtube.com%2Fplaylist%3Flist%3DUUMOl-J-ovSJhA3or73Q2uVpow&submit=true

Is it possible to add the public "Upload" date as a new column?

Thank you for the great project btw!