algo: Add common device image for all GPU code.

Add a common device image for all GPU code.

@d.smith, I introduce here a new folder base/gpu which should contain common code / algorithms in the future. First we need the common identifier added here for xpu. Once this is merged, can you adapt your other MRs (!1132 (closed), !1135 (closed)) to use GPUReco as the image in your kernels?

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mentioned in merge request !1070 (merged)

Dear @f.uhlig, @v.friese, @p.-a.loizeau,

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@fweig So this essentially means that we will put all the XPU code into the same library?

I'd put it all device code into libAlgo for now. Host-code can be put anywhere. Just needs to link against libAlgo to call kernels.

@fweig Shouldn't this also be removed?

Ah, yes, this struct can also be removed. Overlooked it.

!1132 (closed) and !1135 (closed) were updated.