Add support for Question Answering like with QnA Maker

[jrpavoncello]

These CLI tools don't seem to have support for Azure's new Question Answering service like it does for QnA Maker - i.e. things that build automation might do like adding/updating/removing/training/publishing/exporting knowledge bases, and replacing the alterations list.

Describe the solution you'd like
Add an equivalent CLI like what is done for QnA Maker

Describe alternatives you've considered
We could migrate our CI/CD pipelines over to use the REST API for Question Answering, though this would increase the scope a bit of our migration. According to the QnA Maker documentation they will stop allowing new services as of October of this year which puts our production environment at risk if we ever need to spin up new resources, so we are trying to get migrated as quickly as possible.

Related to #6413 and #1339

[enhancement]

[ksk385]

We are looking for an option like this one as well. Thanks!

[birla]

MSFT has completely deprecated QnA maker and customers want to migrate to the new service. Seems like we need to stop using this toolkit as Luis is also on the way to depreciation.

[jrpavoncello]

We converted to using the REST api fully due to this. One of many things that was support was silently dropped for when they switched to orchestrator and language services

[tracyboehrer]

As QnA is on a deprecation path, no new QnA feature will be added.