Read/export crystal rotation/sample orientation in the reduction output file.

[YooSunYoung]

This is currently blocked (not decided how to store it yet) but should be sorted before we start actual measurements with samples.
I'm opening the issue as a reminder...

[YooSunYoung]

Originally from @jl-wynen. scipp/essnmx#155 (comment)

It would be great if we could get a solution that also works for other instruments. For BIFROST, it is stored in an NXparameter group in entry: ('a3' is the sample angle)
bifrost-angle

AFAIK, there is not decision on how ECDC will store it. But it should be something similar.