Image preprocessor refactor

[Sajtospoga01]

Changes external interface of the imagepreprocessor package to use callable classes instead of the hard to use list dict function definition. Internal interface remains the same

[codecov]

Codecov Report

Merging #71 (a27b892) into development (32aef90) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development      #71      +/-   ##
===============================================
+ Coverage        73.85%   73.96%   +0.10%     
===============================================
  Files                8        8              
  Lines              723      726       +3     
===============================================
+ Hits               534      537       +3     
  Misses             189      189              

Files Changed	Coverage Δ
...ts/segmentation_utils_tests.py/flow_reader_test.py	85.41% <ø> (ø)
utilities/segmentation_utils/flowreader.py	58.24% <ø> (ø)
...entation_utils_tests.py/image_preprocessor_test.py	80.00% <100.00%> (-0.96%)	⬇️
...sts/segmentation_utils_tests.py/test_flowreader.py	100.00% <100.00%> (ø)
utilities/segmentation_utils/ImagePreprocessor.py	79.72% <100.00%> (+1.78%)	⬆️

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