Checkmk Werk 15683: notification_rules: implementation of rest-api endpoints

ID: 15683 Title: notification_rules: implementation of rest-api endpoints Component: REST API Level: 1 Class: New feature Version: 2.3.0b1 This werk introduces a new set of endpoints to the rest-api for the configuration of notification rules. Users can now via the rest-api do the following... * Create a notification rule * Update a notification rule * Delete a notification rule * Show a notification rule * Show all notification rules