Added support for OAUTHBEARER auth mechanism

[tonioo]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 85.09%. Comparing base (cc76519) to head (5a571bf).

❗ Current head 5a571bf differs from pull request most recent head 3e3e06f. Consider uploading reports for the commit 3e3e06f to get more accurate results

Files	Patch %	Lines
sievelib/managesieve.py	40.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
- Coverage   85.10%   85.09%   -0.02%     
==========================================
  Files          10       10              
  Lines        1880     1892      +12     
==========================================
+ Hits         1600     1610      +10     
- Misses        280      282       +2     

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