James Holderness 746cf1f148
Add support for the VT answerback capability (#17660)
The answerback feature allows for the user to define a message that the
terminal will transmit to the host whenever an `ENQ` (enquiry) control
character is received.

## Detailed Description of the Pull Request / Additional comments

In Windows Terminal, the message can be configured at the profile level
of the settings file, as a string property named `AnswerbackMessage`.

In ConHost, the message can be configured in the registry, again as a
string value with the name `AnswerbackMessage`.

## Validation Steps Performed

I've confirmed that the control is working as intended in both Windows
Terminal and ConHost using Vttest.

Closes #11946
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