[3.0] Consider making the storage/repository package internal (or merging into storage)

[dweymouth]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

Currently we have some duplicated public APIs between the storage and storage/repository packages. This isn't ideal, but is unavoidable with the current package layout.

Is it possible to construct a solution with the existing API?

No response

Describe the solution you'd like to see.

consider redesigning the package hierarchy to avoid duplicating public APIs