move uploader-related code to uploader.py

[meejah]

fixes #314

This just moves all the uploader-related code to uploader.py

[codecov]

Codecov Report

Merging #324 (aec173a) into master (f21240a) will increase coverage by 0.03%.
The diff coverage is 99.20%.

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
+ Coverage   82.13%   82.17%   +0.03%     
==========================================
  Files          29       30       +1     
  Lines        2233     2238       +5     
  Branches      267      267              
==========================================
+ Hits         1834     1839       +5     
  Misses        322      322              
  Partials       77       77              

Flag	Coverage Δ
integration	51.69% <40.00%> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
src/magic_folder/uploader.py	99.19% <99.19%> (ø)
src/magic_folder/magic_folder.py	79.13% <100.00%> (-10.19%)	⬇️

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