[feature] Add an endpoint that restore experiment and its runs at once

[difince]

Feature Area

/area backend

What feature would you like to see?

Add an endpoint that restores Experiment and all of its Runs at once

/apis/v1beta1/experiments/{id}/runs:unarchive

What is the use case or pain point?

Provide an option to the user to restore an Experiment and all of its Runs in a single click. For more context took a look at this comment - https://github.com/kubeflow/pipelines/issues/5114#issuecomment-777932647 This endpoint will be leveraged by this frontend issue.

Is there a workaround currently?

Yes, do it with multiple steps.

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[zijianjoy]

Hello @difince , can you write a design proposal and discuss it in a KFP community meeting? So we can have a chance to discuss how it fits user's need and how to implement the new APIs.

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