This tracks adding missing Gophercloud support for several OpenStack Trove v1 API areas that were originally submitted together in #3767.

The implementation is being split into smaller PRs by API area to keep review scope manageable:

• Trove datastore version management APIs
• Trove datastore version configuration parameter APIs
• Trove database backup APIs
• Trove backup strategy APIs

OpenStack source references:

• https://github.com/openstack/trove/blob/stable/2026.1/trove/extensions/routes/mgmt.py#L73-L83
• https://github.com/openstack/trove/blob/stable/2026.1/trove/common/api.py#L191-L223