Allow Geometry in Point Instance

Right now the Point Instance node can only instantiate "real" meshes, either individually or in collections. However, we cannot instance procedural meshes (ie. Box Node or Sphere Node outputs, etc.) on points unless we put it in another graph on another object, which is an unnecessary hassle.

My proposal is to add a Geometry option in addition to the Object and Collection options in the Point Instance node which exposes a Geometry pin (which ideally would be a multi-pin so it can randomly pick between different geometries when instancing).

I've tried searching here and on developer.blender.org and cannot find this proposal or task.