implement oauth authentication (#10)

[sigma67]

Here it is. Please test! Looking forward to feedback.

Thanks to @vixalien for the TypeScript POC over at https://github.com/vixalien/muse.

[codecov-commenter]

Codecov Report

Patch coverage: 96.06% and project coverage change: +0.70 🎉

Comparison is base (6aa6c8d) 95.17% compared to head (10e9477) 95.88%.

❗ Current head 10e9477 differs from pull request most recent head 08100dc. Consider uploading reports for the commit 08100dc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #371      +/-   ##
==========================================
+ Coverage   95.17%   95.88%   +0.70%     
==========================================
  Files          26       30       +4     
  Lines        1575     1992     +417     
==========================================
+ Hits         1499     1910     +411     
- Misses         76       82       +6     

Flag	Coverage Δ
unittests	95.88% <96.06%> (+0.70%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
ytmusicapi/auth/headers.py	91.30% <91.30%> (ø)
ytmusicapi/setup.py	91.66% <91.66%> (-0.65%)	⬇️
ytmusicapi/auth/browser.py	92.30% <92.30%> (ø)
ytmusicapi/auth/oauth.py	97.87% <97.87%> (ø)
tests/test.py	98.80% <100.00%> (ø)
ytmusicapi/__init__.py	81.81% <100.00%> (+4.04%)	⬆️
ytmusicapi/constants.py	100.00% <100.00%> (ø)
ytmusicapi/ytmusic.py	93.58% <100.00%> (+2.78%)	⬆️

... and 1 file with indirect coverage changes

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