feat(uploads): add all copyrights related endpoints, refactor test files

[deveaud-m]

Related to #52

[codecov]

Codecov Report

Merging #111 (7b7a89a) into master (cec58ab) will increase coverage by 0.45%.
The diff coverage is 95.83%.

❗ Current head 7b7a89a differs from pull request most recent head db3c2e7. Consider uploading reports for the commit db3c2e7 to get more accurate results

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   88.64%   89.10%   +0.45%     
==========================================
  Files          13       13              
  Lines        1568     1588      +20     
==========================================
+ Hits         1390     1415      +25     
+ Misses        178      173       -5     

Files Changed	Coverage Δ
fossology/obj.py	92.89% <91.66%> (+0.71%)	⬆️
fossology/uploads.py	95.60% <100.00%> (+1.35%)	⬆️

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