support a `cf domain` command to inspect a specific domain

Please provide details on the following items. Failure to do so may result in deletion of your feature request.

cf domain works like cf service

What's the user value of this feature request?
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Scripting is easier with this command

Who is the functionality for?
Who will use this feature?

Primarily for people who script using the CF CLI

How often will this functionality be used by the user?
How often will they use this feature?

Who else is affected by the change?
Does this feature cause a breaking change? Are other users affected by this change?

n/a

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Scripting is unnecessarily cumbersome

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

cf domain DOMAIN

Additional context
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