Is your feature request related to a problem? Please describe.
Currently it is not clear how to create and distribute private packages using APM. In many real-world scenarios, teams need to keep their agent packages private and share them only with specific users or groups within an organization.

Describe the solution you'd like
Support for private packages, similar to how private packages work in npm.

Ideally this would allow:

• Creating private packages
• Sharing them with specific users, teams, or organizations
• Installing them via APM with proper authentication

Describe alternatives you've considered
Currently the alternative is to keep packages in private repositories and manually share or copy them across projects, but this removes many benefits of using a package manager.

Additional context
This feature would work similar to private packages in npm, where packages can be scoped and shared only with selected collaborators or organization teams.