Upgrade to yarn 4 and drop Node.js 16

[webmaster128]

See https://github.com/yarnpkg/berry/blob/master/CHANGELOG.md#400 for the yarn 4 CHANGELOG.

In #1541 there is an example of things that need to be done.

[hoangdv2429]

Can I take this one sir @webmaster128 ?

[webmaster128]

I think yes, but especially for timing I wonder what is the motivation for the upgrade? Is there anything we need urgently and don't have in yarn 3?

[hoangdv2429]

@webmaster128 We will faster compile time and safer import check. I'm not sure if it's urgent or not but happy to work on it nonetheless ❤️‍🔥.

[webmaster128]

okay let's aim for this in the next breaking release. I think we can do a patch release or two without removing Node.js 16. Then we go for it