Group mappings not editable for generic OAuth2/JWT Identity Providers

[DonMartin76]

Even though the groupField and defaultGroups properties work for generic OAuth2 identity providers in the authorization server, the settings aren't surfaced in the Kickstarter the way they are for ADFS.

How to enable manually:

• Specify the groupField JWT mapping
• Add a defaultGroups mapping which maps JWT groups to wicked groups, e.g. like this (in the default.json, section for the specific OAuth2 IDP):

{
  ...
  "groupField": "group",
  "defaultGroups": {
    "some-group": "admin",
    "whatever": "dev"
  }
},
...

Todos:

• Enable/disable group mapping via the "groupField" property
• Add group mapping UI if groupField is specified