Multiple principals as owners of a package

[altkdf]

The current approach of one principal per owner seems quite limited for long-term package maintenance. It has some disadvantages:

• Problematic to have multiple maintainers of a package. This likely requires sharing of the private key for the principal.
• No possibility for adding a backup key.

The first point is my main concern because I want to share access to the package I'm maintaining with my colleagues.

Would it be possible to change replace the owner principal by a list of owner principals, e.g., like on crates.io?