Robot requests should be accessible via circuit conditions

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As of 2.0, all requests are available via circuit conditions… except for roboports. While you can get the logistic requests for the entire network from a single roboport, it would be useful to be able to read the robot requests directly from a single roboport, so you can e.g. insert them directly into a roboport via a buffer chest.

Alternatively, it would be nice if logistic robots could handle robot requests directly from logistic chests by moving the robots from the chests to the roboport. (I imagine that the robots moving out of the chest on their own isn't desired, so, that's a decent alternative.)