Add explicit NonTransformation support throughout codebase

[dotsdl]

We currently operate on Transformations throughout alchemiscale, but AlchemicalNetworks may also feature NonTransformations, which are self-loops on a node (the same node is on both ends of the edge). The way the state store and other components are written, currently NonTransformations are not fully supported. It may be possible to submit AlchemicalNetworks featuring NonTransformations, but creating Tasks on them will likely not work.

We should add in explicit support for NonTransformations in every component applicable, especially the state store.