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Expect a no.
https://support.rockstargames.com/
But you don't have a Steam product code, your CD key is not a Steam key. Product codes from different platforms, old CDs/DVDs, etc are not all universal and usable anywhere. Unless the CD key explicitly states that its use is for Steam, chances are that it's not the intent that you can just throw a key in on Steam and get the game.
No. Wait for the game to be on sale, and re-buy it on Steam.
They removed GFWL from GTA4. // about time too.