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I'm fairly certain (an earlier iteration of) that came out in Windows Vista which is nearly 20 years ago. It was called Aero Snap.

I didn't know that. I actually used Windows until 2019 and only learned about this feature last week. Well, that does it: UI has only gotten worse.

you can also hold down the windows key and use the arrow keys to position the window left/right top left/top right/bottom left/bottom right.

And Windows-shift-up to make a window fill the vertical space of the screen without changing its width.

Released November 8 2006, so not yet 20Y old... quite...