feat: add predicates for each specific type of event

[Diaphteiros]

What this PR does / why we need it:
Adds predicates that allow to filter for specific event types.

Which issue(s) this PR fixes:
None

Special notes for your reviewer:

Release note:

The `pkg/controller` library now contains the following new predicates:
- OnCreatePredicate() reacts only on create events
- OnDeletePredicate() reacts only on delete events
- OnUpdatePredicate() reacts only on update events
- OnGenericPredicate() reacts only on generic events
- OnEventTypePredicate(eventType) allows to pass in the event type dynamically