Add util function for waiting 1 min

[chengliwm]

Fixes hashicorp/terraform-provider-google#24421

Add a util function for waiting 1 min. This PR is a preparation for adding new resources (KAJ Policy Config), which will require waiting 1 min after creation/update.

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[modular-magician]

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[hao-nan-li]

Looks like this template is not used by any resource yet, do you plan to merge this first then use it in different PRs? I feel like this change could be included in other PRs so that this could be tested before it's merged.

[chengliwm]

Looks like this template is not used by any resource yet, do you plan to merge this first then use it in different PRs? I feel like this change could be included in other PRs so that this could be tested before it's merged.

Yes, my plan was to merge this first and used in a different PR. I can put this util together with the resource that uses it.