Add command to delete triggerbinding

[pradeepitm12]

this adds a command to delete a given triggerbinding from a given
namespace

Signed-off-by: Pradeep Kumar pradkuma@redhat.com

Changes

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Release Notes

release-note

[tekton-robot]

The following is the coverage report on pkg/.
Say /test pull-tekton-cli-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/cmd/triggerbinding/delete.go	Do not exist	95.2%

[vdemeester]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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