Prologin OpenID Connect Provider

[lportemo]

This pull request aims to implement an openid connect provider on the Prologin Website.

• [x] OpenID Connect Provider (authorize, token, userinfo)
• [x] Client-Specific Policies (Staff-only clients, group-specific clients, Semifinalists/Finalists specific clients) etc..
• [x] Specific Prologin Claims (contest informations, security clearances)
• [x] Customized templates (consent)

[codecov[bot]]

Codecov Report

Merging #316 (319947f) into master (2cbdcda) will increase coverage by 0.66%. The diff coverage is 85.94%.

@@            Coverage Diff             @@
##           master     #316      +/-   ##
==========================================
+ Coverage   50.78%   51.45%   +0.66%     
==========================================
  Files         194      197       +3     
  Lines        9449     9632     +183     
==========================================
+ Hits         4799     4956     +157     
- Misses       4650     4676      +26     

Impacted Files	Coverage Δ
prologin/prologin/urls.py	68.75% <ø> (ø)
prologin/users/oidc_scopes.py	0.00% <0.00%> (ø)
prologin/users/models.py	70.27% <96.15%> (+2.34%)	:arrow_up:
prologin/prologin/settings/common.py	97.85% <100.00%> (+0.03%)	:arrow_up:
prologin/users/admin.py	100.00% <100.00%> (ø)
...ologin/users/migrations/0007_openidclientpolicy.py	100.00% <100.00%> (ø)
prologin/users/oidc_authz.py	100.00% <100.00%> (ø)
prologin/users/tests.py	100.00% <100.00%> (ø)
... and 1 more

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