Add nn-models to __init__, add PytorchForecastingTransform to __init__

[Mr-Geekman]

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[codecov-commenter]

Codecov Report

Merging #80 (13801e4) into master (d152d9a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
+ Coverage   90.14%   90.16%   +0.01%     
==========================================
  Files          48       49       +1     
  Lines        2152     2156       +4     
==========================================
+ Hits         1940     1944       +4     
  Misses        212      212              

Impacted Files	Coverage Δ
etna/models/nn/__init__.py	100.00% <100.00%> (ø)
etna/transforms/__init__.py	100.00% <100.00%> (ø)

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[iKintosh]

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