dandi authenticate

[luiztauffer]

• Still depends on this to be solved before we can list embargoed dandisets
• _stream_s3_file method might need to include the api key as token in the header as well

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 66.25%. Comparing base (28418b3) to head (58c0dae).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
nwbwidgets/panel.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
+ Coverage   66.24%   66.25%   +0.01%     
==========================================
  Files          35       35              
  Lines        3478     3482       +4     
==========================================
+ Hits         2304     2307       +3     
- Misses       1174     1175       +1     

Flag	Coverage Δ
unittests	66.25% <75.00%> (+0.01%)	⬆️

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