Claim entire org at once

[davidpesce]

The ability to claim an entire org at once. A developer can claim all their plugins at once, with a single PR for all their plugins. But be able to do something like https://github.com/exputo/camp-claim

Can also declare security advisories there.

[davidpesce]

perhaps local repo .clamp-claim files should take priority over the index to prevent hostile/incorrect claims?