Feature: support oauth token auth

[yanyongyu]

fix #113
fix #44

[codecov]

Codecov Report

Attention: Patch coverage is 26.82927% with 270 lines in your changes missing coverage. Please review.

Project coverage is 17.61%. Comparing base (8f41ba1) to head (d5cddc5).

Files	Patch %	Lines
githubkit/auth/oauth.py	26.43%	270 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #115      +/-   ##
==========================================
+ Coverage   17.60%   17.61%   +0.01%     
==========================================
  Files        4793     4793              
  Lines      222199   222480     +281     
==========================================
+ Hits        39115    39190      +75     
- Misses     183084   183290     +206     

Flag	Coverage Δ
unittests	17.61% <26.82%> (+0.01%)	⬆️

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