Add additionalPrinterColumns to pipelinerun CRD

[zxDiscovery]

Changes

Added type, status, startTime and CompletionTime as additional
printer columns in pipelinerun.
This will show the above fields when someone does kubectl get pipelinerun.

Fixes #615

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• Includes tests (if functionality changed/added)
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Release Notes

• kubectl get pipelinerun now gives more information like Type, Status, StartTime,CompletionTime

[vdemeester]

/ok-to-test

[vdemeester]

/lgtm

@zxDiscovery I've updated the PR description to add a release note entry 😉

[tekton-robot]

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