Allow multiple issuers with their clients

[rsoletob]

Now foulkon allows only one issuer in OIDC connector. An enhancement would be to allow multiple issuers with their clients in configuration file.

[rsoletob]

Talking with @gerson24, we have decided to implement a configuration using database instead configuration file. To allow this, we need API operations to manage authentication middlewares. At now, we only support OIDC connector.

Proposal:

• URL: /api/v1/admin/auth/{type}/providers
  Example: /api/v1/admin/auth/oidc/providers

• URN: urn:iws:auth::{type}/{provider}
  Example: urn:iws:auth::oidc/google

• Actions:

  • AddAuthProvider
  • GetAuthProvider
  • ListAuthProvider
  • UpdateAuthProvider
  • RemoveAuthProvider