ILayerDefinition "geometryType" field can be "esriGeometryMultiPatch"

[thw0rted]

I don't expect the library to support consuming the binary MultiPatch encoding natively, but it's possible for a layer definition to come back with the subject value for the geometryType field. The typings for the ILayerDefinition interface should reflect this.

(For such layers, it's possible to specify multipatchOption: "xyFootprint" and get back esriGeometryPolygon features instead, which are easier to work with.)