Add the option to archive a source repository for the migration

## Description

Currently we have the `--lock-source-repo` option for migration and unlock option may come soon ref https://github.com/github/gh-gei/issues/593. These options are helpful thanks.

However, it would be good for us to have the option to [archive a source repository](https://docs.github.com/en/repositories/archiving-a-github-repository) as well.

Archiving a repository behaves similar with locking but different.

For example, unlocking a locked repository happens per a migration and the user cannot unlock it from webUI. Unarchiving an archived repository happens per a repository and the user can unarchive from webUI.

Sometimes we need to make only some source repositories available but IIRC lock option doesn't support the case.

Thanks!