Data opennebula virtual network address range

[shurkys]

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for PR followers and do not help prioritize the request

Description

Refactor: Virtual network address range data source to enhance readability and maintainability.

References

Close #545

New or Affected Resource(s)

• opennebula_virtual_network_address_range data source

Checklist

• [x] I have created an issue and I have mentioned it in References
• [x] My code follows the style guidelines of this project (use go fmt)
• [ ] My changes generate no new warnings or errors
• [ ] I have updated the unit tests and they pass successfully
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have updated the documentation (if needed)
• [ ] I have updated the changelog file