add folder_id as output to folder datasource and resource

[modular-magician]

While reviewing the Cloud Asset Feed resources, we found that folder_id might be a helpful output of google_folder

GoogleCloudPlatform/magic-modules#3750 (comment)

Release Note Template for Downstream PRs (will be copied)

resourcemanager: added `folder_id` as computed attribute to `google_folder` resource and datasource.

Derived from GoogleCloudPlatform/magic-modules#3763

[ghost]

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