Feat: server boot device selection

[cbeti-ionos]

What does this fix or implement?

Implements ionoscloud_server_boot_device_selection resource through which users can choose which bootable entity (inline volume, external volume or a image cdrom) will be used by the server to which the resource is linked to.

Checklist

• [x] PR name added as appropriate (e.g. feat:/fix:/doc:/test:/refactor:)
• [x] Tests added or updated
• [x] Documentation updated
• [x] Changelog updated and version incremented (label: upcoming release)
• [ ] Github Issue linked if any
• [ ] Jira task updated

[sonarcloud[bot]]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

1 New issue
0 Security Hotspots
No data about Coverage
7.3% Duplication on New Code

See analysis details on SonarCloud