Add x11 events

[kimlisa]

resolves #493

Directions to add events

This is how its normally defined in backend:

event = Event{
    Name: X11ForwardEvent,
    Code: X11ForwardCode,
}

1. Add event code (event.name) to eventCodes from services/audit/types.ts
2. Add event type (event.code) to our RawEvents type
3. Add event formatter to our formatters from services/audit/makeEvent.ts
4. Add a icon for event type to our EventIconMap from Audit/EventList/EventTypeCell.tsx
5. Add fixtures (raw json) to events for storybooking Audit/fixtures/index.ts
6. update snapshot