The extension should also support authParams, which are querystring params that might be required by the IdP

[sandrinodimattia]

For example, Azure B2C requires you to set a policy in the querystring, like:

/oauth2/v2.0/authorize?p=B2C_1_signin

This is already supported in the connection, I can set this:

{
  "options": {
    ...
    "authParams": { "p": "B2C_1_signin" }
  },
  "strategy": "oauth2",
  "name": "AzureAD-B2C",
  "enabled_clients": [
    ...
  ]
}

But the UI should make it easy to specify the authParams