Add after_migrate_hook to db:migrate commands

[ylecuyer]

Summary

This is a port of what has been done in https://github.com/adacosta/mongoid_rails_migrations adacosta/mongoid_rails_migrations#54 / adacosta/mongoid_rails_migrations#56 by @JordanThiercelin

Other Information

This change allows to define a ActiveRecord::Migration.after_migrate_hook = -> (log, name, direction, error) { # NOOP }

Which gets called after migrating or reverting (usually with rails db:migrate / rails db:rollback but also works with :up / :down / ...)

A typical use case is to upload the log of the migration to some storage after the migration took place on prod

[rails-bot]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Thank you for your contributions.

[rails-bot]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Thank you for your contributions.