Missing Fleet API Endpoints

[jonasman]

Please list all missing endpoints from Fleet API to be added later

• GET /api/1/users/backup_key
• GET /api/1/users/feature_config
• GET /api/1/users/orders
• GET /api/1/partner_accounts/public_key
• GET /api/1/dx/charging/history
• GET /api/1/dx/charging/sessions
• GET /api/1/dx/warranty/details
• POST /api/1/vehicle_subscriptions
• GET /api/1/vehicle_subscriptions
• POST /api/1/subscriptions
• GET /api/1/subscriptions
• POST /api/1/vehicles/{id}/signed_command
• POST /api/1/vehicles/{vehicle_id}/invitations/{id}/revoke
• POST /api/1/vehicles/{vehicle_id}/invitations
• GET /api/1/vehicles/{vehicle_id}/invitations
• GET /api/1/vehicles/{id}/service_data