Issue #71 and minor bug fixes

[dilyabareeva]

Added tf tutorial and fix bugs in tf-explain function

[annahedstroem]

@dilyabareeva can you resolve merge conflicts and re-run tests after the last PR? then I'll have a go at reviewing :-)

[annahedstroem]

OK approved.

[codecov-commenter]

Codecov Report

Merging #81 (90afb2d) into main (36f0e99) will increase coverage by 2.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   94.18%   96.29%   +2.10%     
==========================================
  Files          16       16              
  Lines        2458     3720    +1262     
==========================================
+ Hits         2315     3582    +1267     
+ Misses        143      138       -5     

Impacted Files	Coverage Δ
quantus/helpers/explanation_func.py	93.48% <100.00%> (+0.79%)	⬆️
quantus/helpers/perturb_func.py	96.12% <0.00%> (-0.31%)	⬇️
quantus/helpers/utils.py	97.54% <0.00%> (+0.87%)	⬆️
quantus/metrics/axiomatic_metrics.py	94.89% <0.00%> (+1.59%)	⬆️
quantus/metrics/complexity_metrics.py	96.73% <0.00%> (+2.15%)	⬆️
quantus/metrics/faithfulness_metrics.py	97.61% <0.00%> (+2.19%)	⬆️
quantus/metrics/randomisation_metrics.py	96.25% <0.00%> (+2.27%)	⬆️
quantus/metrics/robustness_metrics.py	95.59% <0.00%> (+2.28%)	⬆️
quantus/helpers/tf_model.py	96.72% <0.00%> (+2.84%)	⬆️
... and 2 more

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