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Feat/recursive file events

1

Checklist: * [ ] My organization is added to [USERS.md](https://github.com/argoproj/argo-events/blob/master/USERS.md). Add FileEventSource support for recursive file events

**Is your feature request related to a problem? Please describe.** working with the file eventsource feels limiting since it cannot look recuresively inside a folder (i.e. folders inside folders) **Describe...

bug: kafka sensors stop working quietly

2

**Describe the bug** Sensors connected to a kafka eventbus stop working some while after being deployed. **To Reproduce** Steps to reproduce the behavior: 1. Create a kafka eventbus 2. Create...