Extend "/admin/api/applications/find.json" to return OIDC configurations

Endpoint used by Zync

Zync needs to know which flows are enabled. Zync queries the "/admin/api/applications/find.json" endpoint to configure the RH SSO correctly by application.

Implementation would be to send another field in the response (JSON/XML) corresponding to oidc_configuration as described in https://www.keycloak.org/docs-api/4.8/rest-api/index.html

Example:

		"oidc_configuration": {
			"service_accounts_enabled": true,
			"standard_flow_enabled": false,
			"implicit_flow_enabled": true,
			"direct_access_grants_enabled": true				
		}