[CLOSED] Add Metadata Support

[austinzhao-go]

Closed the PR and migrated changes on a feature branch as #4834

[austinzhao-go]

/assign @dibyom
/kind feature

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1beta1/pipelinerun_types.go	80.9%	80.0%	-0.9
pkg/reconciler/pipelinerun/pipelinerun.go	86.0%	86.1%	0.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1beta1/pipelinerun_types.go	80.9%	80.0%	-0.9
pkg/reconciler/pipelinerun/pipelinerun.go	86.0%	86.1%	0.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1beta1/pipelinerun_types.go	80.9%	80.0%	-0.9
pkg/reconciler/pipelinerun/pipelinerun.go	86.0%	86.1%	0.0

[tekton-robot]

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[tekton-robot]

@austinzhao-go: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-tekton-pipeline-alpha-integration-tests	d5ae54a	link	/test pull-tekton-pipeline-alpha-integration-tests

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[tekton-robot]

@austinzhao-go: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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