* Add the RegistryCredentials end point in the service

* add index to moodle in intellij metadata

* Add skeleton for the webservice to download the credentials

* first draft of the file credentials in te

* remove path since we require this workflow to pass in PRs

* Send request from moodle to the autograde service to fetch the credentials

* Implement the download_credentials function

* Add credentials file options

* change description of the admin setting

* implement data_preprocessing + change the tye of the api_key input to be password

* implement the upload_credentials in function for the autograde service in moodle

* fetch the config from the file area in data_preprocessing

* Add function to fetch the credentials in the moodle service

* fix the download credentials DTO to be compatible with jackson

* Add todo note