[Requirement] Load ESTIA NeXus files

[jl-wynen]

Executive summary

Load NeXus files for ESTIA written by the ESS filewriter.

Context and background knowledge

The ESTIA files written by CODA contain events now. But the ESTIA workflow in ESSreflectometry still cannot load NeXus data. So extend the workflow by adding support for loading NeXus files. This may be trivial by basing the workflow on the generic nexus workflow (or even better tof workflow) from ESSreduce.

Inputs

NeXus files written by the fielwriter, e.g., from CODA.

Methodology

Use existing workflow.

Outputs

Data array in memory.

Which interfaces are required?

Integrated into reduction workflow

Test cases

CODA files.

Comments

Part of scipp/essreduce#82