Geometry Nodes: Expose "shade smooth" as an attribute

This patch exposes the "Shade Smooth" value as a boolean attribute.
This setting is exposed as a check-box in the mesh data properties,
but the value is actually stored for every face, allowing some faces
to be shaded smooth with a simple per-face control.

One bonus, this allows at least a workaround to the lack of control
of whether meshes created by nodes are shaded smooth or not: just use
an attribute fill node.

Differential Revision: https://developer.blender.org/D10538

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