Create process images module

[gfabbris]

This module contains functions that are used to load images from the databroker catalog and process them.

• Currently, it is focused on RXES data processing, but I would like it to evolve into generic functions that can be used with any area detector measurement.
• It uses Mark Dean's pyrixs, but it is not supported anymore, so should consider alternatives.
• It tries to use dask as much as possible, but not clear how much of an advantage it is so far.

There is also some cleaning up of testing and documentation of other units.

[codecov-commenter]

Codecov Report

Merging #58 (2538b7e) into main (31b2dcd) will increase coverage by 4.84%. The diff coverage is 78.14%.

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   37.72%   42.57%   +4.84%     
==========================================
  Files           7        9       +2     
  Lines        1169     1313     +144     
==========================================
+ Hits          441      559     +118     
- Misses        728      754      +26     

Impacted Files	Coverage Δ
polartools/diffraction.py	0.00% <0.00%> (ø)
polartools/manage_database.py	53.73% <ø> (ø)
polartools/pressure_calibration.py	87.75% <ø> (ø)
polartools/process_images.py	74.07% <74.07%> (ø)
polartools/load_data.py	73.49% <90.90%> (+1.23%)	:arrow_up:
polartools/_pyrixs.py	92.30% <92.30%> (ø)

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