Add document authentication

[gongul]

Proplems

1. The documentation authentication method is specified as drf DEFAULT_AUTHENTICATION_CLASSES, which prevents the use of other authentication methods. (There is a way to use it by inheriting the class, but I think it is better to set it in SPECTACULAR_SETTINGS like SERVE_PERMISSIONS.)

Result

If you follow the example and set it up, it's over. Even if SERVE_AUTHENTICATION is not specified, it is applied to the DRF as DEFAULT_AUTHENTICATION_CLASSES.

settings.py

SPECTACULAR_SETTINGS = {
    'SERVE_AUTHENTICATION': ['rest_framework.authentication.SessionAuthentication'],
}

[codecov]

Codecov Report

Merging #312 (1611f6f) into master (6b53554) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #312   +/-   ##
=======================================
  Coverage   98.29%   98.29%           
=======================================
  Files          53       53           
  Lines        4569     4573    +4     
=======================================
+ Hits         4491     4495    +4     
  Misses         78       78           

Impacted Files	Coverage Δ
drf_spectacular/settings.py	100.00% <ø> (ø)
drf_spectacular/views.py	98.73% <100.00%> (+0.06%)	⬆️

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