[IMG282] add data_load function via param.ParametrizedFunction

Zhang, Chenrequested to merge
IMG282_dataload_backend into next
  • Original Gitlab Story: IMG282

This PR introduces the following changes

  • add new backend function, load_data implemented as a parameterized function
  • corresponding unit test

Note: As indicated in the comments, the auto matching open-beam and dark-current files using embedded metadata cannot be implemented at this time as it requires a helper class that can handle the metadata in a more generic way.

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