feat: add exoscale profiles

[nhedger]

This PR adds connection profiles for all Exoscale regions.

• at-vie-1
• at-vie-2
• bg-sof-1
• ch-dk-2
• ch-gva-2
• de-fra-1
• de-muc-1

The following additional changes have been made:

1. The description used in the original profile has been modified to better reflect the reality, which is that Exoscale is not a Swiss-only storage provider.

2. The Username Placeholder has been changed from API Key to Access Key, which is the way these keys are called by Exoscale.

[dkocher]

Thanks for your contribution! It would be awesome if you could also update the documentation ¹.

Footnotes

1. https://github.com/iterate-ch/docs/blob/main/protocols/s3/exoscale.md ↩

[nhedger]

Sounds good, I'll send a PR to the docs repo.