Add Files for Jenkins-to-Tekton Interoperability through the CloudEvents Plugin

[ShrutiC-git]

This PR adds Jenkins-to-Tekton interoperability through CloudEvents Plugin PoC files: Files for:

1. Knative Broker (Default CloudEvents and Kafka-broker)
2. Knative Triggers
3. Tekton EventListener with TriggerBinding
4. Tekton Tasks definition

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