Mutliple tensors dataloader

[rchan26]

• Allow passing of multiple tensors in DataSplit and Folds
• Make changes to path construction for networks (return as path and features)

[codecov-commenter]

Codecov Report

Merging #49 (ad8dacd) into develop (4f20c9f) will increase coverage by 0.97%.
Report is 1 commits behind head on develop.
The diff coverage is 70.65%.

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@@             Coverage Diff             @@
##           develop      #49      +/-   ##
===========================================
+ Coverage    55.85%   56.83%   +0.97%     
===========================================
  Files            8        8              
  Lines          990     1010      +20     
===========================================
+ Hits           553      574      +21     
+ Misses         437      436       -1     

Files Changed	Coverage Δ
src/nlpsig/data_preparation.py	74.19% <0.00%> (+0.23%)	⬆️
src/nlpsig/classification_utils.py	94.14% <100.00%> (+0.61%)	⬆️

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