feat(Regions): Add list view

What does this MR do?

Add a section under the Regions for list view/tabular view. Currently, there's no consolidated guidelines around designing a tabular view using the various components available such as table, list or even cards.

Does this MR meet the acceptance criteria?

• The MR title and commit message meet the Pajamas commit conventions
• Add a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Include MR scope that reflects the purpose of the change in the description
  • For example, if this MR is focused on usage guidelines, addressing accessibility challenges could be added separately with a different MR
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Links

gitlab-org/gitlab#340029 (closed)