[backend] Add OpenID proxy configuration capability

[richard-julien]

Add OpenID proxy configuration capability
Must be activated with use_proxy option in the config.
If activated http_proxy and https_proxy will be use.

[codecov]

Codecov Report

Attention: Patch coverage is 18.18182% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 66.74%. Comparing base (bfa6943) to head (60d6d6d).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...i-platform/opencti-graphql/src/config/providers.js	18.18%	9 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6103   +/-   ##
=======================================
  Coverage   66.73%   66.74%           
=======================================
  Files         540      540           
  Lines       64183    64184    +1     
  Branches     5243     5245    +2     
=======================================
+ Hits        42834    42841    +7     
+ Misses      21349    21343    -6     

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