Support for events

[evanelias]

Skeema does not yet support events. This issue tracks the feature request, which has been split out from #41.

Considering this low-priority, unless there's sufficient user interest.

[benmccann]

I wasn't sure what events were, so adding a comment here to clarify for others. They're basically MySQL cronjobs: https://dev.mysql.com/doc/refman/8.0/en/events-overview.html