Load time-dependent transformations from NeXus

[jl-wynen]

Still testing with BIFROST to see if this is what we need.

[jl-wynen]

This causes an issue with the Position domain type. It used to always be a (scalar) Variable. Now, when a component moves, its Position is a 1d data array. That means that the type should be

class Position(sciline.Scope[Component, RunType, sc.Variable | sc.DataArray], sc.Variable | sc.DataArray):

But that is not possible because we can't inherit from unions. So I'm thinking we could always make positions data arrays. But that impacts a lot of downstream code that currently expects variables. But that code is anyway broken for dime dependent positions and might need an update.

Alternatively, we could use a separate path through the workflow and add

class MovingPosition(sciline.Scope[Component, RunType, sc.DataArray], sc.DataArray):

and providers then have to request that type when they can deal with time dependence. The providers constructing Position would then raise if they get time-dependent inputs.

Thoughts? (@SimonHeybrock, @nvaytet)