Allow to revert migrations from the CLI

Editor assessment

Solid feature header for the CLI. The scope medusa-cli precisely identifies the affected package — valuable in a monorepo where release tooling bumps packages independently — and the subject conveys the new capability clearly, staying well within length limits. 'Allow to revert' is slightly unidiomatic; 'Allow reverting migrations' or simply 'Add migration revert command' reads more naturally, though the imperative mood is satisfied. No body accompanies the header; for a CLI subcommand addition, a line describing the command name and its options would have been cheap and helpful for release notes. No breaking markers, correctly none, and the change cleanly signals a minor bump for the CLI package. Compliant with the spec and easy for automation to process.