OAuth Gateways

[Cyberboss]

Closes #1996

🆑
OAuth providers can now forward user tokens to clients.
/:cl:

🆑 Configuration
The new configuration version is 5.4.0
Added Gateway enum to each OAuth provider's configuration section. Can be one of Disabled (default), Enabled, or Only.
/:cl:

🆑 HTTP API
Added gatewayOnly to OAuthProviderInfo models. If true, the provider may only be used for gateway authentication. If null, the provider may NOT be used for gateway authentication.
Added endpoint /api/oauth_gateway. POSTing here with the OAuth authentication scheme will respond with a JSON object containing an accessCode for that provider IF the server is configured to allow OAuth gateways.
/:cl:

🆑 GraphQL API
Added oAuthGateway mutation which accepts the OAuth authentication and will respond with a payload containing an accessCode for that provider IF the server is configured to allow OAuth gateways.
/:cl:

🆑 Nuget: API
Updated to API version 10.11.0.
Added OAuthGatewayResponse model.
Added GatewayOnly nullable boolean field to OAuthProviderInfo.
/:cl:

🆑 Nuget: Client
Updated to API library version 16.2.0.
/:cl:

Merging with [APIDeploy][GQLDeploy][NugetDeploy]

[codecov]

Codecov Report

Attention: Patch coverage is 43.58974% with 44 lines in your changes missing coverage. Please review.

Project coverage is 95.60%. Comparing base (efd68c2) to head (d6a8e10).
Report is 8 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1997      +/-   ##
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- Coverage   95.63%   95.60%   -0.03%     
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  Files         799      802       +3     
  Lines      170498   170557      +59     
  Branches     3502     3510       +8     
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+ Hits       163052   163063      +11     
- Misses       6900     6945      +45     
- Partials      546      549       +3