PCs have never supported this feature to my knowledge, and Apple removed it from their systems a few years ago for some strange reason.
There is the 5V standby power running through the system even when it is switched off, and that DOES power the keyboard. So it's at least possible. However, the keyboard would have to be capable of sending a special "turn on" signal, and then the motherboard would also have to support this so it knows what to do when it gets this signal.
With a little creative wiring, you could probably tap into the Wake-on-LAN feature most motherboards support. A feature that allows a network administrator to turn on a remote computer over a network by sending a special signal over the network to the computer. However, for those of us who aren't electrical or computer engineers, it's probably well beyond what we can do.
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