[RFC]: Create `datasets/random` utilities for generating mock data

[Planeshifter]

Description

This RFC proposes to add a @stdlib/datasets/random namespace with packages for generating mock data.

• [ ] email
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• [ ] streetAddress
• [ ] city
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All these utilities would likely support an options object parameter for control of what to return and sample from underlying datasets, which is why they should reside in @stdlib/datasets.

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Checklist

• [X] I have read and understood the Code of Conduct.
• [X] Searched for existing issues and pull requests.
• [X] The issue name begins with RFC:.