FR: Add custom events in packs

[pyhedgehog]

problem
If you are using custom event in trigger (either in when_trigger field or in configuration.eventType field of emit_event action or in emitEvent() function) and then move this trigger to other instance with pack/install custom event will not (and CAN NOT) be moved with it.

Proposed solutions

1. Add "events" to kind of objects that can be packed.
2. Add any event in when_trigger to custom if not defined.

First option is better as more explicit.
Second option doesn't saves oevent options (like hasChannel field and switch in event_log_settings config).