Add sorting options to ChA events page

[dboyer]

ChAs can create and edit events at /chapter_ambassador/events#/. Currently events are listed in the order they were created which makes it hard for ChAs with many events to find a specific one.

PT would like to add sorting to this page so that ChAs can sort the events by:

• alphabetical order (by event name)
• chronological order by date the event will be held

It would also be helpful to filter by division but that is less important if it's challenging to implement.