Optional "Open" Socket for Boolean Math Node

Add an optional "open" socket to the Boolean Math GeoNodes, to allow an arbitrary number of inputs. This would function the same as with other nodes which already have this open socket. Currently, this additive input process can only be achieved by chaining multiple nodes of the same type together, which is inefficient and adds visual clutter.

This would apply to the standard boolean functions, except for Not, Imply, and Subtract, which cannot use an arbitrary number of inputs. The index Switch node is also shown here as an example of this socket functionality.