Add Ionos provider

[sa7mon]

• Closed bucket
• Open bucket

Per https://www.group-ib.com/blog/cloud-infrastructure-threats/:

The IONOS S3 Object Storage Service endpoints are listed below:

https://s3-eu-central-1.ionoscloud.com (Frankfurt, Germany (EU Central))
https://s3-eu-central-2.ionoscloud.com (Berlin, Germany (EU Central))
https://s3-eu-south-2.ionoscloud.com (Logrono, Spain (EU South))

And legacy endpoints (data may be replicated)

https://s3-de-central.profitbricks.com
https://s3-eu-central-2.profitbricks.com
https://s3-eu-south-2.profitbricks.com