1945 binning

[JackEAllen]

Issue

Closes #1945

Description

• Connects Front-end RITS binned export to back-end
• Bin RITS spectrum data taking a bin size and step size as input
• Bin input validation
• Refactor existing test
• Write additional tests for new methods.

Testing

• Manual Testing:
  • Check that the correct number of files are exported
  • Added print statements within save_rits_images() to validate ROI size and sub-ROI position through each iteration as sub-ROI steps across and down each row and column of ROI.
  • Checked output files
• Reviewed automated tests.

Acceptance Criteria

• Tests (mantidimaging/gui/windows/spectrum_viewer/test ) pass
• Within the spectrum viewer, binned RITS data can now be exported to a folder.
• Binned data is correct for standard deviation and propagated modes

Documentation

See: docs/release_notes/next/feature-1945-export_binned_rits_data

[coveralls]

coverage: 75.671% (-0.01%) from 75.681%
when pulling b221299 on 1945_binning
into bd75526 on main.

[samtygier-stfc]

Forced push from da27677 to d01a1b9 to remove formatting changes on commits.

[MikeSullivan7]

Everything looks good and functions as expected, tests run successfully and errors appear as they should. I tested with the brass dataset.

I would suggest putting a progress bar if possible while the export is running like we would do with the operations. With a large ROI, the export can take a while and looks like the GUI is crashing (i.e. not responding).