fix: NSX SDK list operations are pageable: the API returns a non-null and non-empty

`cursor` field when more pages are available. The previous implementation only
fetched the first page and ignored pagination.

This change updates the list retrieval flow to:
- follow the `cursor` chain until no further pages exist
- accumulate items from all pages
- return a single merged result to the caller

This ensures that list operations return the complete dataset rather than just
the first page.

Author: Andrey Volchkov