ADT CLI features and functionality around private endpoints + links.

[digimaun]

The above single test failure is because an ADT instance was provisioned without a hostname (service failure)

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Thank you for contributing to the IoT extension!

This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines

• If introducing new functionality or modified behavior, are they backed by unit and integration tests?
• In the same context as above are command names and their parameter definitions accurate? Do help docs have sufficient content?
• Have all unit and integration tests passed locally? i.e. pytest <project root> -vv
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• Have you made an entry in HISTORY.rst which concisely explains your feature or change?