Feature/add persist extension

[codecov[bot]]

Codecov Report

Merging #133 into develop will decrease coverage by 0.12%. The diff coverage is 58.9%.

@@             Coverage Diff             @@
##           develop     #133      +/-   ##
===========================================
- Coverage    77.51%   77.38%   -0.13%     
===========================================
  Files           88       89       +1     
  Lines         5318     5373      +55     
===========================================
+ Hits          4122     4158      +36     
- Misses        1196     1215      +19

Impacted Files	Coverage Δ
xenonpy/model/training/extension/validator.py	46.8% <ø> (ø)	:arrow_up:
tests/models/test_trainer.py	92.45% <100%> (+0.29%)	:arrow_up:
tests/models/test_extension.py	97.88% <100%> (+0.03%)	:arrow_up:
xenonpy/datatools/storage.py	86.61% <100%> (+0.09%)	:arrow_up:
xenonpy/model/training/extension/__init__.py	100% <100%> (ø)	:arrow_up:
xenonpy/model/training/trainer.py	41.07% <33.33%> (+1.33%)	:arrow_up:
xenonpy/model/training/base.py	77.34% <55.55%> (-1.65%)	:arrow_down:
xenonpy/model/training/extension/persist.py	57.14% <57.14%> (ø)
xenonpy/model/training/extension/tensor_convert.py	90.9% <80%> (-3.97%)	:arrow_down:
... and 1 more

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