Feature Request: Support for Nexus Repository as Extension Storage Backend

Hi team,

First, thank you for your work on code-marketplace! I noticed that the project currently supports Artifactory as a backend for extension storage, which is great for many enterprise users.

Could you please add support for **Sonatype Nexus Repository** as a storage backend for extensions?

Many organizations use **Nexus** as their primary artifact repository, and having native support would make it much easier to manage extensions.