allow authentification via 'additional_headers'

[dennis-ge]

fixes #265

Test 'test_auth_header_with_catchall_proxy' was modified because the OIDC configuration endpoint is not called anymore when the authentication is provided via the 'additional_headers' parameter. Apart from 'ApiAuthKey' any other auth method can be used.

[weaviate-git-bot]

To avoid any confusion in the future about your contribution to Weaviate, we work with a Contributor License Agreement. If you agree, you can simply add a comment to this PR that you agree with the CLA so that we can merge.

beep boop - the SeMI bot 👋🤖

PS:
Are you already a member of the Weaviate Slack channel?

[dennis-ge]

I agree with the CLA

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.51 ⚠️

Comparison is base (c59d7d6) 96.42% compared to head (ac7660b) 95.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
- Coverage   96.42%   95.92%   -0.51%     
==========================================
  Files          64       64              
  Lines        7561     7564       +3     
==========================================
- Hits         7291     7256      -35     
- Misses        270      308      +38     

Flag	Coverage Δ
unittests	95.92% <100.00%> (-0.51%)	⬇️

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

Impacted Files	Coverage Δ
weaviate/connect/connection.py	90.33% <100.00%> (-0.35%)	⬇️

... and 4 files with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[dirkkul]

thanks a bunch for your contribution!