Feat/multiple OIDC provider

[St4NNi]

Support for multiple OIDC providers

PR enabling support for more than one OIDC provider in parallel. This will make it easier to integrate different identity solutions into the system and bridge the gap to existing OIDC proxies and communities.

Changes

• Removed external_id from user
• Added OIDCMapping to Userattributes, this combines an external_id with an associated provider.
• Added new identity_provider database table that stores the IP URL, an jwks endpoint and a list with allowed audiences
• Unify issuer token checking with existing Dataproxy and Server TokenChecks including the potential for multiple different servers / dataproxies.
• Enable audience checking for all tokens
• Update API added add_oidc_provider and remove_oidc_provider functions for users to combine multiple provider for the same user

[codecov]

Codecov Report

Attention: 949 lines in your changes are missing coverage. Please review.

Comparison is base (c2fe6e1) 53.17% compared to head (b32f399) 51.39%.
Report is 57 commits behind head on dev.

Files	Patch %	Lines
src/hooks/hook_handler.rs	2.29%	255 Missing ⚠️
src/grpc/service_account.rs	0.00%	60 Missing ⚠️
src/auth/issuer_handler.rs	42.15%	59 Missing ⚠️
src/grpc/users.rs	0.00%	58 Missing ⚠️
src/middlelayer/hooks_request_types.rs	0.00%	47 Missing ⚠️
src/utils/conversions.rs	45.97%	47 Missing ⚠️
src/middlelayer/user_db_handler.rs	28.57%	45 Missing ⚠️
src/main.rs	0.00%	35 Missing ⚠️
src/grpc/data_replication.rs	0.00%	30 Missing ⚠️
src/middlelayer/hooks_db_handler.rs	33.33%	30 Missing ⚠️
... and 29 more

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #133      +/-   ##
==========================================
- Coverage   53.17%   51.39%   -1.79%     
==========================================
  Files          73       78       +5     
  Lines       10982    11617     +635     
==========================================
+ Hits         5840     5970     +130     
- Misses       5142     5647     +505     

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[das-Abroxas]

lgtm. Another step in the right direction 🙂