Add authentication with Access Token

[StefanBogdan]

fixes Issue #133

[codecov-commenter]

Codecov Report

Base: 97.14% // Head: 97.14% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (a400925) compared to base (bf431b8).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #149   +/-   ##
=======================================
  Coverage   97.14%   97.14%           
=======================================
  Files          65       65           
  Lines        6454     6456    +2     
=======================================
+ Hits         6270     6272    +2     
  Misses        184      184           

Flag	Coverage Δ
unittests	97.14% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
test/test_util.py	100.00% <ø> (ø)
test/connection/test_connection.py	100.00% <100.00%> (ø)
test/wcs/test_crud_wcs.py	100.00% <100.00%> (ø)
weaviate/auth.py	100.00% <100.00%> (ø)
weaviate/connect/connection.py	99.30% <100.00%> (+0.08%)	⬆️
weaviate/util.py	97.35% <100.00%> (-0.24%)	⬇️
weaviate/wcs/crud_wcs.py	100.00% <100.00%> (ø)

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[dirkkul]

Would you add an example to the docs on how to do this?
https://weaviate.io/developers/weaviate/current/client-libraries/python.html#authentication