Expose API functions from top-level

[cthoyt]

Also update cookiecutter package in cthoyt/cookiecutter-snekpack@fa032ff to have this be a part by default

[codecov-commenter]

Codecov Report

Merging #7 (e6ff3c3) into main (5e1a0cb) will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   79.56%   79.85%   +0.29%     
==========================================
  Files           4        4              
  Lines         137      139       +2     
  Branches       25       25              
==========================================
+ Hits          109      111       +2     
  Misses         17       17              
  Partials       11       11              

Impacted Files	Coverage Δ
src/torch_ppr/__init__.py	100.00% <100.00%> (ø)

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[cthoyt]

@mberr i'd suggest a new release with this one now so you don't have to do from torch_ppr import api